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Ostwald Dilution Law

At 25oC, wh...

Question

At $25^{o} C$ , what changes in $p H$ occur (to the nearest integer) when $0.1$ millimole of a strong acid is added to $25 m L$ of $H_{2} O$ ?

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Solution

The pH of pure water is 7. When 0.1 millimole of strong acid is added, the hydrogen ion concentration will be $\frac{0.1 \times 10^{- 3} m o l}{25 m L \times \frac{1 L}{1000 m L}} = 0.004 M$ .
The pH of the solution is $p H = - l o g [H^{+}] = - l o g 0.004 = 2.398$
Thus, the change in the pH of the solution is $7 - 2.398 = 4.602 \approx 5$

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