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1. 50 ml CH3COOH 0,1 M

50 ml CH3COOK 0,1 M

Ka=10^-5

[H+]=ka×mol asam/mol garam

[H+]=10^-5×(50×0,1)/(50×0,1)

[H+]=10^-5

pH=-log[H+]

pH=-log10^-5

pH=5

2. 100 ml CH3COOH 0,1 M

50 ml CH3COONa 0,1 M

Ka=10^-5

[H+]=ka×mol asam/mol garam

[H+]=10^-5×(100×0,1)/(50×0,1)

[H+]=10^-5×10/5

[H+]=2×10^-5

pH=-log[H+]

pH=-log2×10^-5

pH=5-log2

pH=5-0,3

pH=4,7

3. 100 ml CH3COOH 0,1 M

200 ml CH3COOK 0,1 M

Ka=10^-5

[H+]=ka×mol asam/mol garam

[H+]=10^-5×(100×0,1)/(200×0,1)

[H+]=10^-5×10/20

[H+]=10^-5×0,5

[H+]=5×10^-6

pH=-log[H+]

pH=-log5×10^-6

pH=6-log5

pH=6-0,7

pH=5,3

Jadi nilai pH dari terkecil yaitu 2-1-3.