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m 0,01 0,01
b 0,01 0,01 0,01 0,01
s - - 0,01 0,01
M NaCN = 0,01 ÷ ( 200 ÷ 1000) = 0,05
OH^ - = √ ( Kw ÷ Ka ) × M
= √ ( 10^ -14 ÷ 2 × 10^ -5) × 5 × 10^ -2
= 5 × 10^ -6
pOH = 6 - log 5 ⇒ pH = 8 + log 5