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basa lemah : NH3
HCL + NH3 -> NH4CL
M 200mmol 200mmol
R 200mmol 200mmol 200mmol
S - - 200mmol
MNH4CL = 200/VOLUME LARUTAN = 200/200 = 1MMOL =10^-3M
[OH-] = AKAR kw/ka . Mgaram
= AKAR 10^-14/10^-5 x 10^-3
= AKAR 10^-12
= 10^-6
pOH = 6
pH = 14 - 6 = 8