Question

Find the concentration of sodium acetate when added to \(0.1\ \text{M}\) solution of acetic acid to form a buffer solution of \(pH = 5.5\). (Given: \(pK_a\) of \(\text{CH}_3\text{COOH} = 4.5\))

• A. \(0.1\ \text{M}\)
• B. \(0.01\ \text{M}\)
• C. \(1.0\ \text{M}\)
• D. \(\text{None of these}\)

Hint:

If \(pH - pK_a = 1\), then: \[ \frac{[\text{Salt}]}{[\text{Acid}]} = 10 \]

Answer 1

The Correct Option is C