카프로산. HC6H11O2 52.3 g 2.00 L pH 2.77

카프로산. HC6H11O2 52.3 g 2.00 L pH 2.77

 

 

Caproic acid, HC6H11O2, is found in coconut oil

and is used in making artificial flavors.

A 2.00 L solution of caproic acid has a pH of 2.77

and contains 52.3 g of caproic acid.

What is Ka for caproic acid?

 

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HC6H11O2의 몰질량 = 116.16 g/mol

52.3 g / (116.16 g/mol) = 0.450241 mol

( 참고 https://ywpop.tistory.com/7738 )

 

 

 

몰농도 = 용질 mol수 / 용액 L수

= 0.450241 mol / 2.00 L

= 0.225 mol/L

= 0.225 M

 

 

 

pH = -log[H^+] = 2.77

 

[H^+] = 10^(-2.77) = 0.00169824 M = x

 

 

 

Ka = x^2 / (C-x)

( 참고 https://ywpop.tistory.com/4294 )

 

= (0.00169824)^2 / (0.225 – 0.00169824)

= 1.29×10^(-5)

 

 

 

 

 

[그림] hexanoic acid. caproic acid.

 

 

 

 

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