본문 바로가기
일반화학/[16장] 산-염기 평형

코데인. 1.7×10^(-3) M C18H21NO3 pH 9.59 Kb calculate

by 영원파란 2021. 10. 16.

AdSense@ywpop

728x170

코데인. 1.7×10^(-3) M C18H21NO3 pH 9.59 Kb calculate

 

 

Codeine (C18H21NO3) is derivative of morphine

that is used as an analgesic, narcotic, or antitussive.

It was once commonly used in cough syrups

but is now available only by prescription

because of its addictive properties.

If the pH of a 1.7×10^(-3) M solution of codeine is 9.59,

calculate Kb.

 

---------------------------------------------------

 

pOH = 14 – pH

= 14 – 9.59 = 4.41

 

pOH = –log[OH^-] = 4.41

 

[OH^-] = 10^(-4.41) M

 

 

 

Kb = [NH4^+][OH^-] / [NH3] = (x) (x) / (C–x)

( 참고 https://ywpop.tistory.com/4294 )

 

Kb = [BH^+][OH^-] / [B] = (x) (x) / (C–x)

= (10^(-4.41))^2 / ((1.7×10^(-3)) – (10^(-4.41)))

= 9.1118×10^(-7)

 

 

 

답: Kb = 9.11×10^(-7)

 

 

 

 

[참고] solutions manual

[OH^-] = 10^(-4.41) = 3.9×10^(-5) M

 

Kb = (3.9×10^(-5))^2 / ((1.7×10^(-3)) – (3.9×10^(-5)))

= 9.2×10^(-7)

 

 

 

 

[키워드] 코데인 기준문서, 코데인 용액의 pH 기준문서, codeine dic

 

 

반응형
그리드형(광고전용)

댓글