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19 Nov 2019

To 100mL of a buffer solution that is 0.10M in both HCHO₂ and NaCHO₂, we add 0.0020 moles of HCl. What will be the pH of the buffer after the addition of the strong acid? Assume that the volume change is negligible and K_a for HCHO₂ is 1.7 x 10^-4.

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A) how many mL of NaCHO2 solution should she add to 20.0 mL of the 0.10 M HCHO2 to make a buffer?

B) write a net ionic equation to explain why the pH didn't go up to about 10

3. Formic acid, HCHO₂, has a K_a = 1.8 x 10^-4. We are asked to prepare a buffer solution having a pH of 3.40 from a 0.10 M HCHO₂ (formic acid solution) and 0.10 M NaCHO₂ (sodium formate; formate ion is the conjugate base). How many mL of the NaHCO₂ solution should be added to 20.0 mL of the 0.10 M HCHO₂ solution to make the buffer?

4. When 5 drops of 0.10 M NaOH were added to 20 mL of the buffer in problem 3, the pH went from 3.40 to 3.43. Write a net ionic equation to explain why the pH didnât go up to about 10, as it would have if that amount of NaOH were added to distilled water or to about 20.0 mL of 0.00040 M HCl, which also would have a pH of 3.40.

The Ka of formic acid, HCHO₂, is 1.8 x 10^-4. What is the pH for a 0.35 aqueous solution of sodium formate, NaCHO₂?

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To 100mL of a buffer solution that is 0.10M in both HCHO₂ and NaCHO₂, we add 0.0020 moles of HCl. What will be the pH of the buffer after the addition of the strong acid? Assume that the volume change is negligible and K_a for HCHO₂ is 1.7 x 10^-4.

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To 100mL of a buffer solution that is 0.10M in both HCHO2 and NaCHO2, we add 0.0020 moles of HCl. What will be the pH of the buffer after the addition of the strong acid? Assume that the volume change is negligible and Ka for HCHO2 is 1.7 x 10-4.

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Related textbook solutions

Basic Chemistry

Principles of Chemistry Molecular Approach

Chemistry: Structure and Properties

Principles of Chemistry Molecular Approach

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To 100mL of a buffer solution that is 0.10M in both HCHO₂ and NaCHO₂, we add 0.0020 moles of HCl. What will be the pH of the buffer after the addition of the strong acid? Assume that the volume change is negligible and K_a for HCHO₂ is 1.7 x 10^-4.