Question

# The pH of the solution produced when an aqueous solution of strong acid (pH=5) is mixed with equal volume of an aqueous solution of strong acid of (pH=3) is:

A
3.3
B
3.5
C
4.5
D
4

Solution

## The correct option is B 3.3The concentrations of solutions having pH, 3 and 5 are $$1 \times 10^{-3}M$$ and $$1 \times 10^{-5}M$$ respectively.The concentration of resulting solution is $$= \dfrac { 1 \times 10^{-3}M+1 \times 10^{-5} M} {2} =5 \times 10^{-4} \quad M$$$$pH = -log [H^+] = -log\ 5 \times 10^{-4} =3.2967$$Chemistry

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