Equal volumes of three acid solutions of `pH 3, 4` and `5` are mixed in a vessel. What will be the `H^(+)` ion concentration in the mixture?

Options

A. `3.7xx10^(-4) M`
B. `3.7xx10^(-3) M`
C. `1.11xx10^(-3) M`
D. `1.11xx10^(-4) M`

Answer

A

Explanation

The problem is valid only if strong acids are mixed. After mixing equal volumes of three acids, total volume `=3V`.
`:. [H^(+)]` after mixing
`=(10^(-3)xxV)/(3V)+(10^(-4)xxV)/(3V)+(10^(-5)xxV)/(3V)=(1.11xx10^(-3))/(3)`
`=3.7xx10^(-4)`