Mixtures of solution. Calculate the pH of the following solution. `K_(1)=7.5 xx 10^(-3)M, K_(2)=6.2 xx 10^(-8)M, K_(3)=1.0 xx 10^(-12)M`
40 ml of 0.010 `MH_(3)PO_(4)` + 40 ml of 0.10 M `Na_(3)PO_(4)`.

Answer

7.2