Ionic EquilibriumHard
Question
1 M benzoic acid (pKa = 4.20) and 1M C6H5 COONa solutions are given separately. What is the volume of benzoic acid required to prepare a 300 ml buffer solution of pH = 4.5 ? [log 2 = 0.3]
Options
A.200 ml
B.150 ml
C.100 ml
D.50 ml
Solution
pH = pKa + log 
⇒ 4.5 = 4.2 + log 
⇒ 
= 2
∴ volume of C6H5COONa required = V2 = 200 ml
volume of C6H5COOH required = V1 = 100 ml.
⇒ 4.5 = 4.2 + log ⇒ = 2∴ volume of C6H5COONa required = V2 = 200 ml
volume of C6H5COOH required = V1 = 100 ml.
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