0.050 M HF 80 mL + 0.10 M NaF 100 mL buffer pH

0.050 M HF 80 mL + 0.10 M NaF 100 mL buffer pH

 

 

0.050 M 플루오린화수소산 80 mL와

0.10 M 플루오린화 소듐 100 mL를 섞어 만든 용액

 

 

Calculate the pH of a solution that is made by combining

80 mL of 0.050 M hydrofluoric acid with

100 mL of 0.10 M sodium fluoride.

 

 

 

[참고] HF 완충용액의 pH. 0.60 M HF + 1.00 M KF

[ https://ywpop.tistory.com/18498 ]

 

 

 

> HF의 Ka = 6.8×10^(-4)

 

 

 

(0.050 mol/L) (80/1000 L) = 0.004 mol HF

 

(0.10) (100/1000) = 0.01 mol NaF

 

 

 

Henderson-Hasselbalch 식

pH = pKa + log([짝염기]/[약산])

( 참고 https://ywpop.tistory.com/1926 )

 

= –log(6.8×10^(-4)) + log(0.01 / 0.004)

= 3.57

 

 

 

답: pH = 3.57

 

 

 

 

[키워드] HF 완충용액의 pH 기준