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Homework Help: Chemistry

Posted by Hannah on Tuesday, April 10, 2012 at 12:51pm.

If you add 0.35grams NaF to 150mL of a 0.30M HF, what is the pH of the resulting solution?

To start off would I use the value of 1.4e-11 for F^-^ and 7.2e-4 for HF?



Chemistry(Please help) - DrBob222, Tuesday, April 10, 2012 at 12:04am
This is a buffer problem.
pH = pKa + log(base)/(acid)
Use Ka for HF
Convert g NaF in 150 mL to M, then lug in the numbers.



Chemistry(Please help) - Hannah, Tuesday, April 10, 2012 at 10:39am
So it would be pH=4.74 + log base/acid and I use 7.2e-4 for HF but after I convert g NaF in 150mL to M is this what I use for the base?

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