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M=0.001
dit:pH
cari H+ dahulu
H+=akar Ka×M
H+=akar 5 × 1×10^-3
H+=akar 5×10^-3
H+=akar 5/10×10^-2
H+=akar 0.5×10^-1
H+=0.7×10^-1
skrg ke pH
pH=-log(H+)
pH=-log(0.7×10^-1)
pH=1-log0.7
pH=1+0.1
pH=1.1=1 D.
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