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Question

0.5 M HCl (25 mL) +0.5 M NaOH (10 mL) +40 mL H2O
Find the pH of the resulting solution.

A
1
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B
5
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C
9
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D
3
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Solution

The correct option is C 1
We first find the resulting molarity of the solution.
For an acid-base mixture, resulting molarity is given as:
M=M1V1M2V2V=(0.5×25)(0.5×10)75=0.1 M
[H+]=n×α×C=1×1×0.1 = 0.1 mol/dm3, where n=1
pH = log10[H+]=log100.1 = 1

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