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H2SO4 = 0,1 M x 40 ml = 4 mmol
NH3 + H2SO4 -> (NH4)SO4 + H2O
m : 10 4 - -
r : 4 4 4 4
---------------------------------------------------------------
s : 6mmol - 4 mmol 4 mmol
[OH^-] = Kb x basa lemah/garam
= 10^-5 x 6/4
= 1,5 x 10^-5
pOH = - log 1,5 x 10^-5
= 5 - log 1,5
pH = 14 - (5 - log 1,5)
= 9 + log 1,5