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Finding pH?!?!?!?!?! Please help?!?!?!

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Finding pH?!?!?!?!?! Please help?!?!?!

Post  Purplepiscean on Sat Mar 09, 2013 4:33 pm

I'm really stuck on how to answer these types of problems. This is in example problem but I don't have answer to it.....

Lactic acid (C3H5O3H) has a Ka of 1.3E-4.

A) What is the pH of a 0.14 M lactic acid solution?

B) What is the pH of a solution that contains 0.14 M lactic acid and 0.10 M C3H5O3Na?

C) what is the pH of the above solution after 15.0 mL of 0.50 M HCl are added to 100.0 mL of the solution?

Purplepiscean

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