Air sebanyak 450 ml di tambah kedalam 50 ml larutan HCl 0,1M.ph larutan terbuat dari..

M1 x V1 = M2 x V2
0.1 x 50 = M2 x 500
M2 = 0.01 M
H+ = v. asam x Ma
H+ = 1 x 10^-2
pH = - log H+
pH = - log 10^-2
pH = 2