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m 0,01 0,01
b 0,01 0,01 0,01 0,01
s - - 0,01 0,01
M KNO2 = 0,01 ÷ ( 200÷ 1000 ) = 5 × 10^ -2
OH^ - = √ ( Kw ÷ Ka ) × M
= √ ( 10^ -14 ÷ 4 ÷ 10^ -4 ) × 5 × 10^ -2
= 1,1 × 10^ -6
pOH = 6 - log 1,1 ⇒ pH = 8 + log 1,1