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약산의 이온화. 285 mg of trichloroacetic acid in 10.0 mL

by 영원파란 2019. 3. 14.

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약산의 이온화. 285 mg of trichloroacetic acid in 10.0 mL

 

 

Calculate the analytical and equilibrium molar concentrations of the solute species in an aqueous solution that contains 285 mg of trichloroacetic acid, Cl3CCOOH (163.4 g/mol), in 10.0 mL (the acid is 73% ionized in water).

 

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Let, trichloroacetic acid = HA

 

 

285 mg = 0.285 g HA

0.285 g / (163.4 g/mol) = 0.00174419 mol HA

( 계산 설명 https://ywpop.tistory.com/7738 )

 

 

몰농도 = 0.00174419 mol / 0.0100 L = 0.174 M HA

 

 

......... HA(aq) H^+(aq) + A^-(aq)

초기 ... 100% ..... 0% ........ 0%

평형 ... 27% ...... 73% ....... 73%

 

 

평형에서,

[HA] = 0.174 × 0.27 = 0.047 M

[H^+] = [A^-] = 0.174 0.047 = 0.127 M

 

 

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