Chemistry problem related to Ka and Kb
Favorites|Homepage
Subscriptions | sitemap
HOME > > Chemistry problem related to Ka and Kb

Chemistry problem related to Ka and Kb

[From: ] [author: ] [Date: 12-03-10] [Hit: ]
Codeine is a narcotic pain reliever that forms a salt with HCl.What is the pH of 0.064 codeine hydrochloride? (pKb=5.80)-Codeine is a weak base. Codeine HCl is the salt of a weak base and so would create an acidic solution.......
I was looking over practice exams for a test I have coming up and came across this problem but really have no idea how to do it. can someone please go through the solving process and explain how you got your answer? Thanks in advance! :)

Codeine is a narcotic pain reliever that forms a salt with HCl. What is the pH of 0.064 codeine hydrochloride? (pKb=5.80)

-
Codeine is a weak base. Codeine HCl is the salt of a weak base and so would create an acidic solution.

pKb of codeine equals 5.80. The pKa of codeine HCl = 8.20

The chemical reaction is this:

CodeineH+ + H2O <==> Codeine + H3O+

The Cl- is a spectator ion.

We need the Ka, which is 6.3 x 10^-9

6.3 x 10^-9 = [(x) (x)] / 0.064

x = 2.0 x 10^-5 M (this is the H3O+ concentration)

pH = 4.70

Here's another problem of the same type as yours:

http://www.chemteam.info/AcidBase/Calc-s…
1
keywords: related,to,problem,Kb,Ka,and,Chemistry,Chemistry problem related to Ka and Kb
New
Hot
© 2008-2010 http://www.science-mathematics.com . Program by zplan cms. Theme by wukong .