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m 0,009 0,0015
b 0,003 0,0015 0,0015 0,003
s 0,006 - 0,0015 0,003
OH^- = Kb × (mol basa ÷ mol garam)
= 10^-5 × (0,006 ÷ 0,0015)
= 4 × 10^-5
pOH = 5 - log 4 ⇒ pH = 9 + log 4 = 9 + 2 log 2