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$10 mL of 10^{- 6} MHCl$ solution is mixed with $90 mL$ $H_{2} O, pH$ will change approximately:

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by one unit

by 0.7 unit

by 0.3 unit

by 0.1 unit

answer is C.

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Detailed Solution

$\begin{aligned} [HCl] = 10^{- 7} pH < 7 \\ 10^{- 6} M \to pH = 6 \\ 10^{- 7} M \to pH = 6.7 \end{aligned}$

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