Question

1. If you need to prepare 250.0mL of a pH = 3.60 buffer that has a...

1. If you need to prepare 250.0mL of a pH = 3.60 buffer that has a total buffer concentration of formic acid + formate of 0.030 M, how many moles of each will you need?

2. Discuss how to prepare the solution in Question 1 starting from 0.100M formic acid and 0.150M sodium formate.

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Homework Answers

Answer #1

1.

pKa of formic acid is 3.77

Let

Total volume of buffer solution is 250.0 mL or 0.2500 L (as 1 L = 1000 mL)

2.

In a 250.0 mL standard measuring flask, mix 44.7 mL of 0.100 M formic acid solution and 20.2 mL of 0.150 M sodium formate solution. Dilute the resulting solution to 250 mL mark with distilled water. Mix thoroughly.

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