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HCOONa 0,13Mx0.2L=26x10^-2
[H+]=Ka. mol asam/mol garam
2x10^-4 . 13.10^2/26.10^-2
=10.10^-5
pH= -logH+
pH= -log 10.10^-5
=5-log 10
=4
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