Posted by **Hannah** on Monday, April 9, 2012 at 10:51pm.

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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