MCQ
Choose the correct representation of conductometric titration of benzoic acid vs sodium hydroxide.
- A
- ✓
- C
- D
✓
Answer
Correct option: B.
b
$\underset{\text { (wA) }}{ C _6 H _5 COOH }+\underset{\text { (SB) }}{ NaOH } \longrightarrow \underset{\text { (Salt) }}{ C _6 H _5 COONa }+ H _2 O$
$\underset{\text { (wA) }}{ C _6 H _5 COOH }+\underset{\text { (SB) }}{ NaOH } \longrightarrow \underset{\text { (Salt) }}{ C _6 H _5 COONa }+ H _2 O$
$( A ) \rightarrow( B )$ Free $H ^{+}$ions are replaced by $Na ^{\oplus}$ which decreases conductance.
$(B) \rightarrow (C)$ Un-dissociated benzoic acid reacts with $NaOH$ and forms salt which increases ions \ conductance increases.
$(C) \rightarrow (D)$ After equivalence point at (3), $NaOH$ added further increases $Na ^{\oplus}$ and $OH ^{\circ}$ ions which further increases the conductance.
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