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October 21, 2014

Homework Help: Chemistry

Posted by John on Wednesday, April 6, 2011 at 3:15am.

Calculate amount of solid NaF required to prepare a 250mL acidic buffer with pH=2.75. The initial molarity of HF is .25M but you only have .075L of it.

I have tried many different ways... the most recent and seems to be simplest was using H-H equaion and solving for the CB/CA ratio. Then equivalating this to mol NaF/ (M HF* V HF).... any suggestions?

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