An Acid Solution Of Ph=6 Is Diluted 1000 Times, The pH Of The Final Solution Becomes

Sol:

If an acid solution of pH=6 is diluted 1000 times, then the pH of the final solution becomes 6.99.

Given pH = 6

Therefore, [H^{+}] = 10^{-6}M \)

After dilution:

\( [H^{+}] = \frac{10^{-6}}{1000} \) \( \Rightarrow 10^{-9} M \) \( As [H^{+}] from water (H_{2}O) \) cannot be neglected.

\( Total [H^{+}] = 10^{-9} + 10^{-7} \) \( \Rightarrow 10^{-7} (10^{-2} + 1) \) \( \Rightarrow 10^{-7} (1.01) \) \( pH = – log (1.01 * 10^{-7}) \) \( \Rightarrow 7 – 0.0043 \) \( \Rightarrow 6.9957 \)

Hence proved

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