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pOH=5
[OH-]=10^-5
[OH-]= Kb*mol basa/mol garam
10^-5=10^-5*(0,5*0,1) mmol /2 mol garam
10^-5=10^-5* 50/2 mol garam
mol garam= 25 mmol/0,025 mol
Mr amonium sulfat= 2*14+8*1+32+16*4=132
mol garam=gram/Mr
0,025 mol=gram/132
gram=3,3 gram