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[H+] = a . Ma = 1 . 0,1 = 10-1
PH = - log 10-1 = 1
M1 = 0,1 M
V1 = 250 ml
V2= 500 ml
M2x V2 = M1xV1
M2x 500 = 0,1 x 250
M2 = 0,05 M
pH = -log 0,05
= 2 - log5