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Question

What is the $$pH$$ of the resulting solution when equal volumes of $$0.1\ M\ NaOH$$ and $$0.01\ M\ HCl$$ are mixed?


A
7
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B
1.04
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C
12.65
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D
2
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Solution

The correct option is C 12.65
When equal volumes of 0.1 M NaOH and 0.01 M HCl are mixed, the hydroxide ion concentration is
 $$\displaystyle \frac {0.1-0.01}{2}=0.045 \: M$$
The pOH of the solution is $$\displaystyle pOH= -log \  [OH^-] = -log \ 0.045 = 1.35 $$
The pH of the solution is $$\displaystyle pH = 14-pOH = 14- 1.35 =12.65$$

Chemistry

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