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April 19, 2014

Homework Help: General Chemistry-Acids/Bases

Posted by Evelyn on Wednesday, November 26, 2008 at 2:18pm.

I'm stuck on a couple of similar problems involving pH and acids/bases

1) What is the final pH of a 1L solution that is initially .15 M HF and .2 M NaF after 10 mL of .02 M HCl has been added? Ka=7.2x10^-4

Do i just calculate the total mols of H and divide by the volume, then find the pH?

2.) Calculate the volume of .030 M HNO3 that must be added to a 100mL solution of .25 M NaOh to give a pH of 8.5

This question deals with a strong acid/base, so would I do the same procedure as I would do for number 1? Or would I use a different approach?

Thanks!

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