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M = ( massa jenis x % x 10) / 98
M = (1,225 x 0,4 x 10) / 98
M = 4,9 / 98
M= 0,05 M
Lalu masuk rumus [H+]
[H+] = M x valensi
[H+] = 0,05 x 2
[H+] = 0,1
pH = - log 0,1 = 1
jadi ph nya 1 :)
semoga membantu :)