Jawabanmu

2014-06-19T11:43:32+07:00
Maka,
ph=-log(h⁺)
(h⁺)=10⁻⁴
(h⁺)=mol asam lemah/mol garam * ka
10⁻⁴=5* 10⁻²/x * 10⁻5
10/5*10⁻²=x
x=200 mmol
mmol=massa/mr
200*68=massa
13600 mg=13,6 gram