A scientist wants to prepare 500 ml of 500 mM formate buffer pH 3.00. The pka for formic acid, нсоон, is 3.75. a. Identify the water components. b. Give the dissociation equation involved. c. Give the buffering action when the buffer system is added with (a) small amount of strong acids and (b) small amounts of strong base.

Chemistry: Principles and Reactions
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Chapter14: Equilibria In Acid-base Solutions
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Problem 25QAP: A sodium hydrogen carbonate-sodium carbonate buffer is to be prepared with a pH of 9.40. (a) What...
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A scientist wants to prepare 500 ml of 500 mM formate buffer pH 3.00. The pKa for formic acid,
нсоон, is 3.75.
a. Identify the water components.
b. Give the dissociation equation involved.
c. Give the buffering action when the buffer system is added with (a) small amount of strong acids and
(b) small amounts of strong base.
d. What mass (in grams) of sodium formate (molar mass = 68 g/mol) is needed to separate the said
buffer? Report the answer in 2 decimal places. (Show complete solution)
e. What volume (in milliliters) of formic acid (molar mass = 46 g/mol; density = 1.22 g/mL) is needed to
prepare the said buffer? Report the answer in 2 decimals places. (Show complete solution)
Transcribed Image Text:A scientist wants to prepare 500 ml of 500 mM formate buffer pH 3.00. The pKa for formic acid, нсоон, is 3.75. a. Identify the water components. b. Give the dissociation equation involved. c. Give the buffering action when the buffer system is added with (a) small amount of strong acids and (b) small amounts of strong base. d. What mass (in grams) of sodium formate (molar mass = 68 g/mol) is needed to separate the said buffer? Report the answer in 2 decimal places. (Show complete solution) e. What volume (in milliliters) of formic acid (molar mass = 46 g/mol; density = 1.22 g/mL) is needed to prepare the said buffer? Report the answer in 2 decimals places. (Show complete solution)
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