B) pH Mg(Ch3COO)2
[OH-] = √ Kw/Ka.[g]
=√ 10^-14/10^-5. 4x10^-1
=2x10^-5
pOH = 5-log2
pH= 9+log 2
D) pH (NH4)2SO4
[H+] = √Kw/Kb .[g]
= √ 10^-14/10^-5. 3x10^-2
=√3x10^-5,5
pH= 5,5-log√3
Maaf kalo salah
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B) pH Mg(Ch3COO)2
[OH-] = √ Kw/Ka.[g]
=√ 10^-14/10^-5. 4x10^-1
=2x10^-5
pOH = 5-log2
pH= 9+log 2
D) pH (NH4)2SO4
[H+] = √Kw/Kb .[g]
= √ 10^-14/10^-5. 3x10^-2
=√3x10^-5,5
pH= 5,5-log√3
Maaf kalo salah