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m: y. 0,5 2y 0,5 - -
b: y.0,5 y. 0,5 y.0,5 y. 0,5
s: - y. 0,5 y.0,5 y.0,5
[H+] = Ka x mol asam lemah yang sisa/mol Garam yang sisa x Valensi garam
5 x Y.0,5/ y.0,5
= 5
pH = Log 5 = 0,698