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Question

Solution of a monobasic acid has a pH = $$5$$. If one mL of it diluted to $$1$$ litre, what will be the pH of the resulting solution?


A
3.45
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B
6.96
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C
8.58
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D
10.25
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Solution

The correct option is D $$6.96$$
$$pH = -log[H^+] ; [H^+] = 10^{-pH}$$
$$pH=5;  [H^+] = 10^{-5}$$
After dilution
$$\dfrac{10^{-5}}{1000} = 10^{-8}M$$
$$Total [H^+] = 10^{-8} + 10^{-7} = 1.1*10^{-7}$$
$$pH = -log[H^+] = -log(1.1*10^{-7}) = 6.96$$

Chemistry

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