0.085 M HNO2 + 0.10 M KNO2 buffer pH

HNO2의 Ka = 4.5×10^(-4)

Calculate the pH of a solution containing

0.085 M nitrous acid (HNO2; Ka = 4.5×10^(-4)) and

0.10 M potassium nitrite (KNO2).

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Henderson-Hasselbalch 식

pH = pKa + log([짝염기]/[약산])

( 참고 https://ywpop.tistory.com/1926 )

= –log(4.5×10^(-4)) + log(0.10 / 0.085)

= 3.4174

답: pH = 3.4

[키워드] HNO2 완충용액의 pH 기준