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January 30, 2015

January 30, 2015

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?

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