0.105 M CH3COOH 24.0 mL + 0.130 M NaOH. initial pH

0.105 M CH3COOH 24.0 mL + 0.130 M NaOH. initial pH

 

 

24.0 mL of 0.105 M acetic acid (HC2H3O2)

will be titrated with 0.130 M sodium hydroxide (NaOH).

The Ka of acetic acid is 1.77×10^(-5).

a) the initial pH

 

 

Consider the titration of a 24.0 mL sample of 0.105 M CH3COOH

with 0.130 M NaOH. What is the initial pH?

 

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▶ 참고: 약산-강염기 적정

[ https://ywpop.tistory.com/2736 ]

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x = [Ka × C]^(1/2)

( 참고 https://ywpop.tistory.com/4294 )

 

= [(1.77×10^(-5)) × 0.105]^(1/2)

= 0.00136 M = [H^+]

 

 

 

pH = –log[H^+]

= –log(0.00136)

= 2.87

 

 

 

 

[참고] 아세트산의 초기 몰수

= (0.105 mol/L) × (24.0/1000 L) = 0.00252 mol

 

 

 

 

[키워드] CH3COOH NaOH 적정 기준문서, 약산 강염기 적정 기준문서