The Plot of pH-metric titration of weak base $\mathrm{NH}_{4} \mathrm{OH}$ vs strong acid HCl looks like:

JEE Main · 2022 · 27 Jul 2022 · Shift 2 · Equilibrium

The Plot of pH-metric titration of weak base

NH_{4} OH

vs strong acid HCl looks like:

(A)(see structure)
✓ Correct
(B)(see structure)
(C)(see structure)
(D)(see structure)

Answer: (A)

Solution

For the titration of a weak base (

NH_{4} OH

) with a strong acid (HCl), the pH curve starts at a moderately high pH (around 11), then decreases gradually at first, followed by a sharp drop near the equivalence point. At the equivalence point, the pH is less than 7 (acidic) because the salt formed (

NH_{4} Cl

) undergoes hydrolysis to produce

H^{+}

ions. After the equivalence point, the pH continues to decrease gradually as excess strong acid is added. The correct curve shows these characteristics.

JEE Main · 2022 · 27 Jul 2022 · Shift 2 · Single correct option

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