Jawabanmu

2014-06-20T21:55:47+07:00
PH = 5
H+ = 10^-5

H+ = Ka (asam lemah / basa konjugasi )
10^-5 = 10^-5 (10/x)
x = 10 mmol

mmol = mgr/Mr
10 x 82 = mgr 
mgr = 820 mgram
gram = 0,82 gram