Q.120 If a buffer solution has 0.1 molar concentration of benzoic acid and 0.01 molar
concentration of sodium benzoate, then what is the pKa value of buffer solution when its PH is 3
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Answer:
3
Explanation:
Using Handerson equation
PH = pKa + log [CH3COO-]/[CH3COOH]
PH = PKa + log [0.1/ 0.01]
PH = pKa + log10
pKa = pH = 3
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