The pH of a solution is 4.0. What should be the change in the hydrogen ion concentration of the solution, if its pH is to be increased to 5.0?

Halved

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Doubled

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Decreases to its original concentration.

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Decreased by 10 times.

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Solution

The correct option is B Decreased by 10 times.
Change in pH is $Δ p H = p H_{2} - p H_{1} = 5.0 - 4.0 = 1.0$ .

Thus, the ratio of hydrogen ion concentration is $\frac{[H^{+}]_{2}}{[H^{+}]_{1}} = 10^{- 1} = 0.1$ .

Thus, the hydrogen ion concentration should be decreased by 10 times.

Option D is correct.

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