JEE Mains · Chemistry · STD 11 - 6.2. Equilibrium - II (icon Equilibrium)
At \(25°C\), \(20.0\) mL of \(0.2\) M weak monoprotic acid HX is titrated against \(0.2\) M NaOH. The pH of the solution (a) at the start of the titration (when NaOH has not been added) and (b) when \(10\) mL of NaOH is added respectively, are:
Given: \(K_a = 5 \times 10^{-4}\), \(pK_a = 3.3\), \(\alpha << 1\)
| (a) | (b) |
|---|
- A \(0.7 \quad 2.0\)
- B \(2.0 \quad 3.3\)
- C \(1.1 \quad 2.2\)
- D \(3.0 \quad 2.2\)
Answer & Solution
Correct Answer
(B) \(2.0 \quad 3.3\)
Step-by-step Solution
Detailed explanation
For part (a), at the start of the titration, the solution contains only the weak acid HX. The concentration of HX is \(C = 0.2\) M. Using the formula for the hydrogen ion concentration of a weak acid with \(\alpha \ll 1\):…
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