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July 30, 2015

Homework Help: Chemistry

Posted by Jake on Thursday, April 7, 2011 at 12:39am.

I can't figure out how to solve this problem:
The Ka for hydroflouric acid is 4.5 *10^-4 at 298K. Calculate the amount of sold NaF that is required to prepare a 250. mL acidic buffer with pH = 2.75. The initial molarity of hydroflouric acid is .250M but you have only 75mL.

I looked on here, and someone said they got .2 g. I'm not getting anything close to that. Help please?

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