First slide

PH scale, PH of strong acids and strong bases

Question

The pH of a solution is 5. To this solution acid was added so that its pH value be comes 2.0. The increase in H' concentration is :

Easy

A

100 times
B

5 times
C

2.5 times
D

1000 times

Solution

$pH = - \log_{10} [H^{+}]$
original pH=5
Original [H⁺]=10−pH=10⁻⁵ M
New p^H=2
New [H⁺]=10−pH=10⁻² M
The increase in [H+]=10⁻⁵M10⁻² M−10⁻⁵M=9.99×10²≃1000 times

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