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M: 9 mmol 1,5 mmol
R: -3 mmol -1,5 mmol +1,5 mmol
S: 6 mol - 1,5 mmol
Penyangga:
[OH⁻] = Kb x mol basa/mol garam
= 10⁻⁵ x 6/1,5
= 10⁻⁵ x 4 M
pOH = - log 4x10⁻⁵
= 5 - log 4
pH = 14 - (5 - log 4)
= 9 + log 4