Jawabanmu

2014-03-23T19:24:16+07:00
PH = 4
H+=1.10^-4

H+=ka. mol asam lemah/mol garamnya
1.10^-4 = 2.10^-5 X 0,2/mol garamnya
1.10^-4 = 4.10^-6/mol garamnya
mol garam x 1.10^-4 = 4.10^-6
mol garam = 4.10^-6/1.10^-4
mol garam = 4.10^-2


:)