An aqueous solution of 'X' is added slowly to an aqueous solution of 'Y'. The variation in conductiv — Electrochemistry Chemistry Question

💡 Solution & Explanation

\textbf{Match the Following — Conductometric Titration Curves} \textbf{Column I (Titration type)} \quad \textbf{Column II (Conductance vs volume curve)} \textbf{Analysis:} \textbf{A. Strong acid vs Strong base (HCl + NaOH):} Conductance decreases as H\textsuperscript{+} (high mobility) is replaced by Na\textsuperscript{+}. At equivalence point, conductance is minimum (only NaCl). After equivalence, conductance rises as excess OH\textsuperscript{-} is added. Shape: V-shaped with minimum at equivalence point \quad → \textbf{R} \textbf{B. Weak acid vs Strong base (CH\textsubscript{3}COOH + NaOH):} Initially very low conductance (weak acid barely ionised). As NaOH is added, salt (CH\textsubscript{3}COONa) forms — conductance rises slowly. After equivalence, excess NaOH causes sharp rise. Shape: nearly flat then steep rise after equivalence \quad → \textbf{S} \textbf{C. Strong acid vs Weak base (HCl + NH\textsubscript{4}OH):} Conductance decreases as mobile H\textsuperscript{+} is replaced by NH\textsubscript{4}\textsuperscript{+} (less mobile). After equivalence, adding more NH\textsubscript{4}OH (weak base) causes very slight change (barely ionised). Shape: decreasing then nearly flat after equivalence \quad → \textbf{Q} \textbf{D. Weak acid vs Weak base (CH\textsubscript{3}COOH + NH\textsubscript{4}OH):} Both are poorly ionised. Conductance changes are very small throughout. The curve is nearly flat with a poorly defined minimum. Shape: nearly flat throughout \quad → \textbf{P} \textbf{Answer: A→R; B→S; C→Q; D→P}