Friday
April 25, 2014

Homework Help: Chem 2

Posted by Jess on Thursday, July 19, 2007 at 1:47am.

A 0.15 M solution of butanoic acid, C3H7COOH, has a pH of 2.8210. Find the Ka of butanoic acid.

Call buanoic acid HB.
Then the ionization is
HB ==> H^+ + B^-
To start (HB) = 0.15
(H^+) = 0 and (B^-) = 0
After ionization, (H^+) = x but that is found by converting pH to (H^+)
(B^-) = x = same as (H^+)
(HB) = 0.15-x = 0.15 - (H^+) from above.
Set up Ka expression, plug in x and 0.15-x in the appropriate places and solve for Ka. Post your work if you get stuck.

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Chemistry - Use activity coefficients to find the concentration of hydrogen ions...
Chemistry - Use activity coefficients to find the concentration of hydrogen ions...
chemistry - A 1.00M solution of a hypothetical weak acid (HB) has a pH of 2.85. ...
chemistry - Please calculate the pH and [H+] of a 0.30 mol/L solution of ...
Chemistry - Use activity coefficients to find the concentration of hydrogen ions...
Chemistry - Find the pH during the titration of 20.00 mL of 0.2380 M butanoic ...
chemistry - The question asks, "Butanoic acid has a partition coeff of 3.0 when ...
chemistry - The question asks, "Butanoic acid has a partition coeff of 3.0 when ...
chemistry - If the acid base reaction HA(aq)+B^-(aq)---> HB(aq)+A^-(aq) <...
Chemistry! - HB, pH=1 To neutralize 10cm3 it took 5.00cm3 NaOH 10cm3 of the ...

Search
Members