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Ka for para-aminobenzoic acid (PABA), HC7H6NO2

by 영원파란 2016. 11. 11.

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Ka for para-aminobenzoic acid (PABA), HC7H6NO2

약산의 Ka

 

 

Para-aminobenzoic acid (PABA), HC7H6NO2, is used in some sunscreen agents.

A solution is made by dissolving 0.263 mol of PABA in enough water to make 750.0 mL of solution. The solution has [H+] = 2.6×10^-3 M. What is the Ka for PABA?

 

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PABA 용액의 몰농도 = 용질 mol/ 용액 L

= 0.263 mol / 0.7500 L = 0.351 M

 

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

Ka = (x)(x) / C-x

( 식 설명 http://ywpop.tistory.com/4294 )

= [2.6×10^(-3)]^2 / [0.351 - (2.6×10^(-3))]

= 1.94×10^-5

 

 

: 1.9×10^-5

 

 

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