Equal volumes of two solutions of hydrochloric acid are mixed. One solution has a pH 1 while the other has a pH 5. The pH of the resulting solution is :

Question

Prashant Kotian · Accepted Answer

Correct answer: B. The concentration of H+ ions in both solutions before dilution is 1 10 M and 5 10 M respectively. After dilution the volume becomes double of the original volume. H in the solution is 1 5 10 10 2 2 . For the pH to rise to 2 the H due to the first solution needs to reduce by th 1 10 But it has reduced only 1 2 . In addition to that H ions have also come from second solution. Therefore, pH rises from 1 but does not reach 2. 1 < pH < 2

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