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2NH4OH+H2SO4 -> (NH4)2SO4 +H2O
NH4OH : H2SO4 : (NH4)2SO4 : H2O
m:0,04 : 0,01
t: 0,02 : 0,01 : 0,01 : 0,01
s: 0,02 : 0,01 :0,01 :0,01
[OH]= Kb b/b.g
= 10^-5 210^-2/ 2. 10^-2
=10^-5
POH= -Log OH
= 5
PH= 14-POH= 9 (c)