Question:

In some solutions, the concentration of \(\mathrm{H_3O^+}\) remains constant even when small amounts of strong acid or strong base are added to them. These solutions are known as:

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Resistance of pH to small additions of acid or base is the definition of a buffer.
Updated On: Nov 11, 2026
  • Ideal solutions
  • Colloidal solutions
  • True solutions
  • Buffer solutions
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The Correct Option is D

Solution and Explanation

A buffer solution (weak acid + its conjugate base, or weak base + its conjugate acid) resists changes in pH on adding small amounts of strong acid or base because the added \(\mathrm{H^+}\) or \(\mathrm{OH^-}\) is consumed by the conjugate pair, keeping \([\mathrm{H_3O^+}]\) nearly constant.
Answer: (4) Buffer solutions
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