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pOH = 14 -12 = 2
dari pOH di dapatkan [OH-] = 10^-2
dari [OH-] yg dicari konsentrasi basa
M NaOH = [OH-] / valensi basa = 10^-2 / 1 =
10^-2 atau 0,01
M NaOH = (gram / Mr) x 1000/V
0,01 = gram/40 x 1000/10000
0,01 = gram/40 x 0,1
0,1 = gram/40
gram = 4