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Nh3 + h2so ---> (nh4)2 so4
Awal. 20 mmol. 5mmol
Reaksi. 5mmol. 5mmol
Sisa. 15mmol. 0mmol
(oh-) = 15 mmol
-------------
150 ml
= 0,1 M
PH = -log (oh-)
= -log 1x10^-1
= 1