Saturday
July 26, 2014

Homework Help: chemistry

Posted by Abigail on Tuesday, April 15, 2008 at 4:56pm.

Please let me know if my answer to the following question is correct.

Question:
What is the concentration of a weak base if its Kb = 1.4 x 10-11 and its pH = 8.75?

Answer:
Converting pH to H^+ concentration using the formula H^+ = 10^-ph, therefore 10^-8.75 gives an H^+ concentration value of 1.0 x 10^-9. Now, using the formula Ka=Kw/Kb and subsitituing in the values (Ka = 1.4 x10^-14/1.4 x 10^-11) gives 1.0 x 10^-3.
Now, subtracting 1.0 x 10^-3 from 1.0x 10^-9 gives a concentration of 9.9 x 10^-4 mol/L

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

chemistry - A weak base with a concentration of 1.3 mol/L has a percent ...
Chemistry - In the titration of a weak acid with a strong base, the pH at the ...
Chemistry - 1. As the strength of a weak acid increases, the proportion of ions ...
chemistry - hello, I can't seem to solve this question. i tried to look up ...
Math - Can someone please help me to answer the following question? The question...
chemistry - hello, I can't seem to solve this question. i tried to look up ...
Chemistry - What is the pH of the solution created by combining 2.50 mL of the 0...
Chemistry - If an equal number of moles of the weak acid HOCN and the strong ...
chemistry - A weak base that encompasses a concentration of 1.4 mol per litre ...
chemistry - A weak base with a concentration of 1.3 mol/L has a percent ...

Search
Members