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kita anggap aja Volumer larutannya 1Liter ya
Mr CH3COONa = 12 + 3 + 12 + 32 + 23 = 82
PH = 4
[H]⁺ = 10⁻⁴
[H]⁺ = Ka a
garam
garam = Ka . a
[H]⁺
garam = 10⁻⁵ x 4 / 10⁻⁴
garam = 0,4
Mgaram = gr / Mr
gr = M x Mr = 0,4 x 82 = 32,8 gr