Question

Equal volumes of pH=1, pH=2, pH=3 and pH=4 are mixed together. Final pH is represented as a.b (rounded up to nearest value). Then a + b is

Answer 1

Answer:

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Explanation:

It is given that equal volumes of two solutions having pH=1 and pH=4 are mixed together.

The values of pH equal to 1 and 4 correspond to hydrogen ion concentrations of 10

−1

M and 10

−4

M respectively.

Assume x L of each solution is mixed.

The concentration of resulting solution is given by

x+x

0.1×x+0.0001×x

=

2

0.1+0.0001

=0.05 M

pH=−log[H

+

]=−log(0.05)=1.3010

Hence, the pH of the resulting solution is 1.3010.