Electrochemistry Question 2
Question 2 - 24 January - Shift 2
Choose the correct representation of conductometric titration of benzoic acid vs sodium hydroxide.
(1)
(2)
(3)
(4)
Show Answer
Answer: (2)
Solution:
$\underset{\text{ (wA) }}{C_6 H_5 COOH}+\underset{\text{ (SB) }}{NaOH} \longrightarrow \underset{\text{ (Salt) }}{C_6 H_5 COONa}+\underset{}{H_2 O}$
$(A) \to(B)$ Free $H^{+}$ions are replaced by $Na^{\oplus}$ which decreases conductance.
(B) $\to$ (C) Un-dissociated benzoic acid reacts with $NaOH$ and forms salt which increases ions & conductance increases.
(C) $\to$ (D) After equivalence point at (3), $NaOH$ added further increases $Na^{\oplus} \& OH^{\odot}$ ions which further increases the conductance.
