The pH of a solution is 3. When it’s pH changes to 6 then H+ ion concentration :

Foundation

Chemistry Foundation

pH Scale and Meaning

Question

The pH of a solution is 3. When it’s pH changes to 6 then H⁺ ion concentration :

increases three times.

decreases 1000 times.

increases two times.

decreases 100 times.

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H⁺ ion concentration in a solution of pH3 = 1 × 10^–3 M H⁺ ion concentration in a solution of pH6 = 1 × 10^–6 M
∴ change in [H⁺] = $\frac{1 \times 10^{- 6}}{1 \times 10^{- 3}}$ = 10^–3M
so H⁺ion concentration decreases by 1000 times.