Jawabanmu

2014-04-16T22:34:25+07:00
PH = 10  
POH  = 4 
[OH] = 10^-4 
[OH] = √Kw/Ka [CH3COOK]
10^-8 = 10^-14/2.10^-5 [CH3COOK] 
[CH3COOK] = 10^-8/5.10^-10 = 20 M 
[CH3COOK] = n/V = n/0,2 = 20 M
n = 4 mol
gr = n.Mr = 4.(2(12)+2(16)+3(1)+39) = 4(98) = 392 gram

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