When a weak base solution (50 mL of 0.1 M NH 4 OH) is titra…

Chemistry Ionic Equilibrium Common Ion Effect, Isohydric Solutions, Solubility Product, Ionic Product of Water and Salt Hydrolysis Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 13, 2026

When a weak base solution (50 mL of 0.1 M NH 4 OH) is titrated with a strong acid (0.1 M HCl), the pH of solution initially decreases fast and then decreases slowly till near equivalence point (as shown in the figure). Which of the following statements is/are true ?

The initial fast decrement in pH is due to fast consumption of free OH – ions by HCl.

The slow decrease of pH is due to formation of an acidic buffer solution after addition of some HCl.

The slope of shown pH graph (magnitude only) will be minimum when 25 mL of 0.1 M HCl is added.

The slow decrease of pH is due to formation of a basic buffer solution after addition of some HCl.

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(a,b,c,d)

Initial decrement is due to consumption of free OH – ions, then slow decrement in pH is due to basic buffer solution and minimum slope will be there when there is best buffer action ([salt] / [base] = 1)

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