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Q.

What volume (in ml) of 0.10 M sodium formate solution should be added to 50 ml of 0.05 M formic acid to produce a buffer solution of pH 4. [pKa for formic acid is 3. 7]

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answer is 50.

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Detailed Solution

 Given,

pH value = 4. 

pKa for formic acid = 3. 7

pH=pKa+log⁡SaltAcid 4=3.7+log⁡0.1×V50×0.05   ⇒V=50mL

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