Calculate the pH of the following two buffer solutions: (a) 2.0 M CH3COONa/2.0 M CH3COOH, (b) 0.20 M CH3COONa/0.20 M CH3COOH. Which is the more effective buffer? Why?
Answers
The pH of buffer solution (a) is 4.74, and the pH of buffer solution (b) is 4.74. Solution (a) is a more effective buffer because it has a higher concentration.
To calculate the pH of the buffer solutions, we will use the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]). CH₃COOH is a weak acid with a pKa of 4.74. In both solutions, the ratio of [A-] (CH₃COONa) to [HA] (CH₃COOH) is 1, as their concentrations are equal.
For both solutions:
pH = 4.74 + log(1) = 4.74 + 0 = 4.74
Although both solutions have the same pH, solution (a) is more effective as a buffer because it has higher concentrations (2.0 M) of both the acid (CH₃COOH) and its conjugate base (CH₃COONa), compared to solution (b) with 0.20 M concentrations.
Higher concentrations increase the buffer's ability to resist pH changes when small amounts of acids or bases are added.
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Related Questions
What substance did the plant most likely absorb from the water for the process that produces the oxygen gas? How do you know?
Answers
The plant most likely absorb from the water for the process that produces the oxygen gas is Carbon Dioxide .
What is photosynthesis ?
Photosynthesis is defined as the processes that bring about the manufacturing of food by green plants.
Food is complex energy-rich organic matter which living organisms feed on to obtain nutrients, substances necessary for life. Green plants which are known as autotrophs has the ability to produce their own food through the process of photosynthesis.
The main features of photosynthesis include:
It takes place in the chloroplasts of plants, in the presence of sunlight.
The energy needed for the process is gotten from sunlight which is absorbed by chlorophyll found in the chloroplasts.
The raw materials used are low-energy containing inorganic compounds, example: carbon dioxide and water.
The final products are high-energy containing sugars. oxygen is given off as a waste product.
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Atom is anything that has mass and occupies space. True or false
Answers
Answer:
False.
Explanation:
Matter is anything that has mass and occupies space, not atoms.
what is the molarity of the hydrochloric acid solution if 21.5 ml of a 0.234 m sodium hydroxide solution are needed to titrate a 25.0 ml sample of the hydrochloric acid solution
Answers
The molarity of the hydrochloric acid solution if 21.5 ml of a 0.234 m sodium hydroxide solution are needed to titrate a 25.0 ml sample of the hydrochloric acid solution is 0.2 M.
The reaction is given as :
NaOH + HCl ----> NaCl + H₂O
molarity of NaOH = 0.234 M
volume of solution = 21.5 mL = 0.0215 L
moles of NaOH = molarity × volume
= 0.234 × 0.0215
= 0.0050 mol
The molarity expression is given as :
The molarity of HCl = moles / volume
= 0.0050 / 0.025
= 0.2 M
The molarity of HCl is 0.2 M.
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Which of the following factors affects the amount of heat absorbed by a substance?
A. Boiling point of the substance
B. Specific heat capacity of the substance
C. Melting point of the substance
D. Shape of the substance
Answers
Answer:
The correct answer is B, "Specific heat capacity of the substance."
Explanation:
I just took the test. I hope this helps!
Heat absorbed changes the bonds of the molecules or the compounds to alter their state. The specific heat capacity affects the amount of heat absorbed. Thus, option B is correct.
What is specific heat capacity?Specific heat capacity is defined as the amount of heat or energy absorbed by the kilogram of the solid reactant when the system experiences a rise in temperature. It is measured in J/(kg K) or J/(kg °C).
The specific heat capacity, the mass of the substance, temperature, and the phase of the substance affects the absorption of the heat from the surrounding. The specific heat affects absorption as it tells about the substance's ability to take the heat energy.
Therefore, specific heat capacity affects heat absorption.
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A force of 792 mN is applied to a substance with a mass of 295,000 mg.
Determine the acceleration of the particle.
Answers
Answer:
Acceleration = 2.68 m/s² (Approx.)
Explanation:
Given:
Force = 792 mN = 0.792 N
Mass = 295,000 mg = 0.295 kg
Find:
Acceleration
Computation:
Acceleration = Force / mass
Acceleration = 0.792 / 0.295
Acceleration = 2.68 m/s² (Approx.)
Consider the following equilibrium:
4nh3(g) + 3o2(g) right arrow 2n2(g) + 6h2o(g) 1531 kj
the concentrations of the reactants would decrease after ammonia was added to the system.
a. true
b. false
Answers
Consider the following equilibrium:
4NH₃ (g) + 3O₂ (g) ⇄ 2N₂ (g) + 6H₂O (g) + 1531 kJ
The given statement is True, because
According to Le Ch's Principle:
Systems that have attained the state of chemical equilibrium will tend to maintain their equilibrium state.
External factors such as the addition of products and reactants result in the disruption of the equilibrium state.
we expect the system to shift to the direction that offsets the change in concentration.
This results in the state of chemical equilibrium to be reestablished.
Hence, The statement is true,
The addition of more ammonia (a reactant) would offset the state of equilibrium.To restore chemical equilibrium, the system must consume the excess reactants to form more products.A shift to favor the products side occurs.To learn more about equilibrium here
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The novice nurse administers RBCs to a client. Which actions by the novice nurse are deemed safe by the nurse preceptor? (Select all that apply.)
Priming the intravenous tubing with 0.9% sodium chloride.
Obtaining and documenting a full set of baseline vital signs.
NOT setting the infusion rate to deliver blood within 6 hours - it should be 4 hours.
Also require large gauge catheters 20-24 gauge.
Should stay with client for first 15 minutes
Answers
According to the nurse preceptor, the new nurse adheres to a number of safe practices while administering red blood cells (RBCs) to a patient.
Based on the given options, the actions that are deemed safe by the nurse preceptor are:
Priming the intravenous tubing with 0.9% sodium chloride.Obtaining and documenting a full set of baseline vital signs.Setting the infusion rate to deliver blood within 4 hours instead of 6 hours.Using large gauge catheters (20-24 gauge). When giving red blood cells (RBCs) to a patient, the novice nurse follows a number of safe procedures, according to the nurse preceptor. To ensure appropriate flushing and lower the chance of an air embolism, the inexperienced nurse correctly primes the intravenous tube with 0.9% sodium chloride in the first step. The second step is for the inexperienced nurse to collect and record a complete set of baseline vital signs. This creates a baseline for monitoring the client's status both before and after the transfusion. Third, in accordance with the advised duration for safe administration, the nurse modifies the infusion rate to administer the RBCs in 4 hours as opposed to 6 hours. Fourth, the inexperienced nurse employs big gauge catheters (20-24 gauge) to promote quick and smooth blood product flow and reduce problems.
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What is the main idea of quantum mechanical model?
Answers
The main idea of the quantum mechanical model is that it describes particles, such as electrons, as having both wave-like and particle-like properties.
The quantum mechanical model is a modern and more accurate description of the behavior of atoms and subatomic particles than the classical mechanical model.
According to the quantum mechanical model, electrons in atoms are described by mathematical functions called wave functions, or orbitals, which give the probability of finding the electron at any given location in space.
The quantum mechanical model also explains the electronic structure of atoms, including the number and distribution of electrons in their orbitals, and how electrons are arranged in energy levels and sublevels.
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How does hydrogen bonding take place?
Answers
Answer:results from the attractive force between a hydrogen atom covalently bonded to a electronegative atom
Explanation:
if a reaction is 1st order, how many half-lives are required for 99.9% of the original sample to be consumed?
Answers
In a first-order reaction, time required for completion of 99.9% is 10 times of half-life (t1/2) of the reaction.
In a first-order reaction, the rate of the reaction is inversely correlated with the concentration of the reactant. In other words, if the concentration doubles, so does the pace of the reaction. The half-life of a reaction is defined as the amount of time it takes for half of the reactant to be consumed. The half-life of a first-order reaction is given by:
t1/2 = 0.693/k
where k is the rate constant of the reaction.
The chemical kinetics rate law, which connects the molar concentration of reactants to reaction rate, uses the rate constant as a proportionality factor. The letter k in an equation designates it, which is also referred to as the reaction rate constant or reaction rate coefficient.
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-K-12 Scientific Method
3/10
A(n)
simply states what will be observed and always
true, but does not explain why.
Answers
Answer:
The correct answer is - scientific law.
Explanation:
A scientific law is an explanation to a well observed phenomenon of the world which is found true every time tested and universal proven fact, but the reason behind the phenomenon and its existence.
To explain the scientific law there will be various explanation that are called scientific theory, however these theories can not be proved.
Thus, the correct answer is - scientific law.
determine the oh and ph of a solution that is 0.140m in f
Answers
The [OH⁻] of the solution is approximately 7.14 x 10⁻¹³ M, and the pH is approximately 5.85.
To determine the [OH⁻] and pH of a solution, we need to consider the concentration of hydroxide ions ([OH⁻]) or the hydronium ions ([H₃O⁺]). In this case, we are given the concentration of fluoride ions (F⁻), which is the conjugate base of hydrofluoric acid (HF). Since HF is a weak acid, it partially dissociates in water to produce F⁻ and H₃O⁺ ions.
The concentration of F- ions is given as 0.140 M. To find the [OH⁻], we can use the fact that [OH⁻] = Kw / [H₃O⁺], where Kw is the ion product of water (approximately 1.0 x 10⁻¹⁴ M² at 25°C).
Assuming the [H₃O⁺] concentration is equal to the F- concentration, we can calculate the [OH⁻] as follows:
Kw = [H₃O⁺][OH⁻]
1.0 x 10⁻¹⁴ = (0.140)([OH⁻])
[OH-] = (1.0 x 10⁻¹⁴) / (0.140)
[OH-] ≈ 7.14 x 10⁻¹³ M
To find the pH, we can use the relationship pH = -log[H₃O⁺]. Since [H₃O⁺] is assumed to be equal to the F⁻ concentration, we can calculate the pH as follows:
pH = -log(0.140)
pH ≈ 5.85
Therefore, the [OH⁻] of the solution is approximately 7.14 x 10⁻¹³ M, and the pH is approximately 5.85.
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The complete question is:
Determine the [OH-] and pH of a solution that is 0.140 M in F-.
The _______ is the part of the neuron that carries information away from the cell body.
cell body
axon
dendrite
nucleus
Answers
it is where electrical impulses from the neuron travel away to be received by other neurons!
Answer:
b
Explanation:
how are the earth and moon alike
Answers
Answer:
they both revolve or rotate around something
Explanation:
The earth revolves around the sun and the moon rotates around the earth.
Given three (3.00) moles of gold (Au), how many grams do you have?
a. 66 g
b. 197 g
C. 591 g
d. 6.02 x 1023 g
Answers
Directions: Use the words in the word box to complete the following sentences.
acceleration
gravity
counteract
resistance
balanced
force
When the forces acting on an object are _______________ , there is no change in the object's motion.
A _________________ acting on a resting object can cause the object to move.
On Earth, __________________ pulls all objects toward the ground.
When a force acts in the opposite direction of another force, the forces ______________ each other.
More than one force acting on a falling object can reduce its downward ____________________.
Air _____________________ is caused by molecules of air pushing against a moving object.
Answers
Answer:
if u answer my today's a pic quatiom I will give u ur any questions
Answer:
balanced
resistance
gravity
counteract
acceleration
Two descriptions about physical quantities are given below:
Quantity A: It remains constant.
Quantity B: It depends on gravitational pull.
What quantities are these most likely describing?
a Both Quantity A and Quantity B are mass.
b Both Quantity A and Quantity B are weight.
c Quantity A is weight and Quantity B is mass.
d Quantity A is mass and Quantity B is weight.
Answers
Answer:
quantity A is mass and quantity B is wieght
Answer:
D. is correct, like the first person said
Explanation:
One of the following isn't the reason why this experiment is considered to be a green one?
-The experiment uses environmentally friendly solvents.
-The experiment provides a high atom economy.
-The experiment uses a catalyst.
-The experiment avoids excess waste.
-The experiment avoids the use of hazardous reagents.
Answers
The experiment uses a catalyst.
A catalyst is a substance that increases the rate of a chemical reaction without being consumed or permanently changed in the process. It works by providing an alternative pathway for the reaction to occur, lowering the activation energy required for the reaction to take place.
Catalysts can be used in various chemical reactions, from industrial processes to biological systems.
The use of a catalyst in an experiment does not necessarily make it a "green" experiment.
While a catalyst can help increase reaction efficiency and reduce the amount of reagents needed, it does not directly address the environmental impact or sustainability of the experiment.
The other options mentioned, such as using environmentally friendly solvents, providing a high atom economy, avoiding excess waste, and avoiding the use of hazardous reagents, are all factors that contribute to making an experiment more environmentally friendly and thus could be considered as reasons for it being a green experiment.
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36. Pigment lying on top of the tissue is most likely:
a. endogenous
b. anthracotic
c. artifact
d. exogenous
Answers
The most likely answer is d. exogenous. Pigment refers to any substance that imparts color to a tissue or organism.
In this context, pigment lying on top of the tissue suggests that it has been introduced from an external source rather than being produced within the tissue itself. Endogenous pigments, such as melanin or hemoglobin, are produced by the body and are not typically found lying on top of tissues. Anthracotic pigments are a type of endogenous pigment that result from the accumulation of carbon particles, usually from environmental pollution. Artifacts are objects or substances that are introduced during tissue preparation or analysis, and are not typically found on the tissue itself.
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was there a horrible outbreak of the flu last year
Answers
Answer:Conarovirus
Explanation:
Match the different methods used for calculating revenue and profit to the formulas used for calculating them. total revenue average revenue marginal revenue gross profit net profit
Answers
Answer:
See explanation below
Explanation:
1) Total Revenue:
Total revenue refers to the total amount of income that is generated when a company sells or offers their service.
It is usually calculated as the product of the product or services sold by the quantity.
It is calculated by ;
TR = Q * P
Where TR = Total Revenue
Q = Quantity
P = Price
2.) Average Revenue:
Average revenue is the revenue gotten by a company per unit of output sold. It is calculated by:
AR = TR / Q
Where AR = Average Revenue
TR = Total Revenue
Q. = Quantity
3.) Marginal Revenue:
This is the net revenue that is generated by selling an additional unit of commodity; which is the change in total revealer unit. It is calculated by:
MR = change in Total Revenue / change in Quantity
Where MR = Marginal Revenue
4.) Gross Profit:
Gross profit is the amount of revenue left after factoring out the cost of production and sales and servicing.
It is calculated by subtracting revenue from the cost of goods sold -
Gross Profit = Revenue - Cost of goods sold
Net Profit:
Net profit is the amount of money a company has left after subtracting all interests, tax expenses and cost.
It is calculated by;
Net Profit = Gross Profit - Expenses
Which set of approximate bond angles at C1, C2, and C3 of the following molecule indicates the correct shape? C3 C2 C1 NFC-CH=CH2 Select one: a. C1 180, C2 120, C3 109.5 b. C1 180, C2 120, C3 120 c. C1 120, C2 120, C3 120 d. C1 120, C2 120, C3 180
Answers
The correct set of approximate bond angles at C1, C2, and C3 of the molecule "NFC-CH=CH2" is: a. C1 180, C2 120, C3 109.5.
This molecule is a linear alkene, where the double bond (C=C) is located between C2 and C3. The bond angles reflect the shape of the molecule, which is linear. The C1 atom is bonded to two other carbons and forms a 180-degree bond angle with them, indicating a straight line. The C2 and C3 atoms, which are bonded to a carbon and a double bond, form 120-degree bond angles with each other and the neighboring carbons, again indicating a straight line. The bond angle between the two double bonded carbons (C2-C3) is slightly less than the ideal value of 120 degrees due to the pi bond between them, which pushes the atoms slightly apart. The correct set of approximate bond angles at C1, C2, and C3 of the molecule "NFC-CH=CH2" is: a. C1 180, C2 120, C3 109.5.
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if you want brainliest answer this pleaseeee
a bacterium has a length of 5.5 10-6 m but seen through a powerful microscope it appears to be 1.2 10-3 m. what is the magnification of the microscope?
a virtual image is produced by a convex mirror that is 1.60 cm from the mirror. if the magnification is 0.20 how far from the mirror is the object?
Answers
Answer:
what are the answer choices
Explanation:
Answer:
3x
Explanation:
Water molecules can react with each other according to this equation: 2H2O ⇌ H3O OH−. If H3O is added, the equilibrium will____. If it is taken away, the equilibrium will____. If OH− is added, the equilibrium will____. If it is removed, the equilibrium will____.
Answers
The equation 2H2O ⇌ H3O+ + OH- represents the self-ionization of water, where water molecules can react with each other to form hydronium ions (H3O+) and hydroxide ions (OH-).
If H3O+ is added:
Adding hydronium ions (H3O+) will shift the equilibrium to the left, favoring the reverse reaction. This means more water molecules will combine to form H2O, reducing the concentration of H3O+ ions.
If H3O+ is taken away:
Removing hydronium ions (H3O+) will shift the equilibrium to the right, favoring the forward reaction. This means more water molecules will ionize to form H3O+ ions to compensate for the loss.
If OH- is added:
Adding hydroxide ions (OH-) will shift the equilibrium to the left, favoring the reverse reaction. This means more water molecules will combine to form H2O, reducing the concentration of OH- ions.
If OH- is removed:
Removing hydroxide ions (OH-) will shift the equilibrium to the right, favoring the forward reaction. This means more water molecules will ionize to form OH- ions to compensate for the loss.
In summary, adding or removing H3O+ or OH- ions will cause the equilibrium to shift in order to maintain the balance of concentrations and satisfy the equilibrium expression.
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During one of the trials in this project, the initial weight of ethanol is 86 g and after the combustion, the final weight of ethanol is 11. What are the number of moles of ethanol consumed during the experiment
Answers
During one of the trials in this project, the initial weight of ethanol is 86 g and after the combustion, the final weight of ethanol is 11. Hence, 1.63 moles of ethanol was consumed.
To determine the number of moles of ethanol consumed during the experiment, we first need to calculate the change in mass of ethanol.
Change in mass = Initial mass - Final mass
Change in mass = 86 g - 11 g
Change in mass = 75 g
Next, we need to convert the change in mass from grams to moles using the molar mass of ethanol.
Molar mass of ethanol = 46.07 g/mol
Number of moles of ethanol consumed = Change in mass / Molar mass
Number of moles of ethanol consumed = 75 g / 46.07 g/mol
Number of moles of ethanol consumed = 1.63 mol
Therefore, during this trial in the project, 1.63 moles of ethanol were consumed during the experiment.
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A liquid has a density of 1.4g/mL and its volume is 17 mL. What is the mass for this amount of liquid?
Answers
The mass for this amount of liquid, with density of 1.4g/mL and volume, 17 mL is equals to the 23.8 grams.
We have, a liquid with the following informations,Density of liquid, D = 1.4g/mL
Volume of liquid, V = 17 mL
The density of a liquid is a measure of how heavy it is for the amount being measured. If two different liquids have the same amount or volume, the liquid that weighs more is denser. The equation to calculate density is given by the formula Density = Mass/Volume. Let the mass for this amount of liquid be 'M'.
So, D = M/V => M = D×V
Thus, Mass for this amount of liquid, M
= 1.4g/mL × 17 mL
= 1.4 × 17 g
= 23.8 grams
Hence, required mass of amount is 23.8 g.
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Help me with this. I dont even know what this compound is...
Answers
Answer:
c
Explanation:
Answer
the other person is right its c
Explanation:
none
indentify the type of scientific knowledge represented by each statement lol theory hypothesis
Answers
1. The Earth revolves around the Sun. Theory: This is a scientific theory, which is an explanation supported by a large body of evidence that explains how a natural phenomenon or phenomenon works.
What is theory?A theory is an explanation or principle that is based on observations, experiments, and logical reasoning. It is an organized system of ideas, concepts, and principles intended to explain how something works or why something happens. Theories are used to explain and predict phenomena and can be used to develop hypotheses, which can then be tested to gain a better understanding of the natural or social world. Theories can be used to understand and explain a wide variety of phenomena in the natural and social sciences, including the behavior of particles, the functioning of the human body, and the social dynamics of large groups of people.
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To calculate acceleration you must know both the objects velocity and _______________ 1pt
Answers
Answer:
i think its speed
Explanation:
Answer:
Velocety and mass
Explanation:
In the given three dimensional molecular structure the differently colored spheres represent different types of atoms. Write a molecular formula for this model
Answers
Answer: penlalalalaooooaaaaaaaaaaa
Explanation: pen