Homework Answers
As NaOH is a base, it will react with the acetic acid to produce acetate salt.
That means concentration of acetic acid with decreases, while the concentration of acetate will increase by addition of small amount of NaOH.
OH- + CH3COOH -------> CH3COO- + H2O
Therefore, option C is correct.
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Consider a buffer composed of the weak acid acetic acid (CH3COOH) and the conjugate base sodium acetate (NaCH3COO). Which pair of concentrations results in the most effective buffer (i.e. has the highest buffer capacity)? A. 0.10 M CH3COOH; 0.10 M NaCH3COO B. 0.90 M CH3COOH; 0.10 M NaCH3COO C. 0.10 M CH3COOH; 0.90 M NaCH3COO D. 0.50 M CH3COOH; 0.50 M NaCH3COO
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You are given 75 mL of 0.70 M acetic acid/acetate buffer to test. The starting composition of the two major species are: Concentration of CH,COOH: 0.250 M Concentration of CH,COO: 0.450 M a. Calculate the initial pH of the buffer. Clearly show all work required to arrive at your answer. b. You add 1.0 mL of 2.00 M HCl to the buffer. Calculate the molarity of H, O' added as HCl, and the final molarities of acetic acid and acetate...
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A buffer is prepared by adding 20.0 g of sodium acetate (CH3COONa) to 480 mL of a 0.160 M acetic acid(CH3COOH) solution. 1. Determine the pHpH of the buffer. 2. Write the complete ionic equation for the reaction that occurs when a few drops of hydrochloric acid are added to the buffer.Identify all of the phases in your answer. 3. Write the complete ionic equation for the reaction that occurs when a few drops of sodium hydroxide solution are added...
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A buffer is prepared by adding 21.0 g of sodium acetate (CH3COONa) to 500 mL of...
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A 1 liter solution contains 0.373 M acetic acid and 0.497 M potassium acetate. Addition of 0.093 moles of calcium hydroxide will: (Assume that the volume does not change upon the addition of calcium hydroxide.) Raise the pH slightly Lower the pH slightly Raise the pH by several units Lower the pH by several units Not change the pH Exceed thu ouffer capacity The pK, value for CH, COOH is 4.74. Would a buffer prepared from CH3COOH and CH,COONa with...
You are making a pH 5.0 buffer with acetic acid (pKa = 4.75) and sodium acetate. You want the total concentration of acetate ([acetic acid] + [sodium acetate] ), to be 0.50 M. What concentrations of acetic acid and sodium acetate do you use to make your buffer? acetic acid sodium acetate
You are given 75 mL of 0.70 M acetic acid/acetate buffer to test. The starting composition of the two major species are: Concentration of CH,COOH: 0.250 M Concentration of CH,COO: 0.450 M a. Calculate the initial pH of the buffer. Clearly show all work required to arrive at your answer. b. You add 1.0 mL of 2.00 M HCl to the buffer. Calculate the molarity of H, O' added as HCl, and the final molarities of acetic acid and acetate...
3. One liter of buffer solution was prepared by mixing 0.1 mole of acetic acid CH3COOH and 0.05 mole of sodium acetate CH3COONa. Calculate a. pH of that solution b. How much of a strong base, say NaOH, in mol/L needs to be added to that solution to change its pH to 6.0? Notes and useful data: For acetic acid pK4.75 For carbonic acid pKa 6.3 and pKa 10.3 Sodium acetate CH3COONa dissociates entirely to Na'CH3COO
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