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
B
6.96
C
8.58
D
10.25

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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