Sunday

August 31, 2014

August 31, 2014

Posted by **Taasha** on Saturday, August 4, 2007 at 4:50pm.

If someone can please just help me get started!!

Lat's call propanoic acid, HP, to save time on typing. It's a weak acid so it ionizes partially as follows:

HP ==> H^+ + P^-

Initially HP = 0.21 M, (H^+) = 0 and (P^-) = 0.

For every x mole of HP that ionizes, (H^+) will be x and (P^-) will be x. The amount of HP remaining will be 0.2 - x.

Set up Ka.

Ka = (H^+)(P^-)/(HP) = 1.3 x 10^-5

Plug in x for (H^+) and (P^-) and 0.21 - x for (HP). solve for (H^+) and pH. (P^-) = (H^+) and (HP) = 0.21 - x. I will let you finish. Post your work if you get stuck.

I figured out the concentrations, with your help! (thank you), but I am not quite sure how to figure out the percent dissociation. How do I go about this?

**Related Questions**

ap chemistry - For propanoic acid (HC3H5O2, Ka = 1.3 10-5), determine the ...

CHEMISTRY - For propanoic acid (HC3H5O2, Ka = 1.3 10-5), determine the ...

chemistry - 1. if 15.0mL of 4.5 M NaOH are diluted with water to a volume of ...

General Chemistry - Calculate the pH and include the balanced equation for the ...

Chemistry - What must be the molarity of an acetic acid solution if it has the ...

chemistry - A 0.15M solution of weak triprotic acid is adjusted (base added) so ...

Hayden - Chloroacetic acid has a relatively large equilibrium constant, so at ...

chemistry - A 0.15M solution of weak triprotic acid is adjusted (base added) so ...

chemistry - I have no clue, please help and explain! =) Find the pH of a 0.150 M...

Chemistry - Use activity coefficients to find the concentration of hydrogen ions...