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 ?

Let volume of each solution taken is 1 litH+1 = 10-3 M,  H+2 = 10-4 M ,   H+3 = 10-5 M  for the given acids.Mmix Vmix = M1V1 + M2V2 + M3V3 Mmix × 3 = [10-3 × 1]+[10-4 × 1]+[10-5× 1] Mmix=10-5100+10+13 = 111 ×10-5 3 =37 × 10-5 M =3.7 × 10-4M