A biochemistry student wants to make an acidic buffer with pH of 4.20. They will start with 250 mL of a 0.5 M acetic acid (HC2H3O2) solution. Acetic acid has a pKa of 4.75. There are two ways to make this buffer. 1.1 The student is given 250 mL of a 0.5 M acetic acid (HC2H3O2) solution. What mass (in g) of sodium acetate (NaC,H¿O2: 82.03 g/mol) should they add to make this a solution with pH of 4.20? Round your answer to 3 significant digits. Assume that dissolving the solid will not change the volume of the solution. g of NaC,H;O2 1.2 The lab is currently out of sodium acetate. A friend suggests using sodium hydroxide. How does adding sodium hydroxide to an acetic acid solution make a buffer solution? Explain using a chemical equation. No calculation needed.
A biochemistry student wants to make an acidic buffer with pH of 4.20. They will start with 250 mL of a 0.5 M acetic acid (HC2H3O2) solution. Acetic acid has a pKa of 4.75. There are two ways to make this buffer. 1.1 The student is given 250 mL of a 0.5 M acetic acid (HC2H3O2) solution. What mass (in g) of sodium acetate (NaC,H¿O2: 82.03 g/mol) should they add to make this a solution with pH of 4.20? Round your answer to 3 significant digits. Assume that dissolving the solid will not change the volume of the solution. g of NaC,H;O2 1.2 The lab is currently out of sodium acetate. A friend suggests using sodium hydroxide. How does adding sodium hydroxide to an acetic acid solution make a buffer solution? Explain using a chemical equation. No calculation needed.
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Chapter16: Acid-base Equilibria
Section: Chapter Questions
Problem 16.125QP: A solution made up of 1.0 M NH3 and 0.50 M (NH4)2SO4 has a pH of 9.26. a Write the net ionic...
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Transcribed Image Text:A biochemistry student wants to make an acidic buffer with pH of 4.20.
They will start with 250 mL of a 0.5 M acetic acid (HC2H3O2) solution. Acetic acid has a pka of
4.75. There are two ways to make this buffer.
1.1
The student is given 250 mL of a 0.5 M acetic acid (HC2H;O2) solution. What mass
(in g) of sodium acetate (NaC,H;O2: 82.03 g/mol) should they add to make this a solution with
pH of 4.20? Round your answer to 3 significant digits. Assume that dissolving the solid will not
change the volume of the solution.
g of Nac,H;O2
1.2
The lab is currently out of sodium acetate. A friend suggests using sodium
hydroxide. How does adding sodium hydroxide to an acetic acid solution make a buffer
solution? Explain using a chemical equation. No calculation needed.
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