Ok. First of all this is a homework problem so please provide your steps on how you solved this.
Calculate thefor the following acids using the given information.
(a) 0.220 M solution of H3AsO4, pH = 1.50
so i know the concentration of H+ ions would be 10^-1.5 = 0.0316 M
I think the dilution of the H3AsO4 is:
H3AsO4 --> 3H + AsO4
now what?