Homework Help: Chem II

Posted by Bianca on Monday, November 19, 2012 at 2:14pm.

Find the mass of sodium formate that must be dissolved in 200.00cm^3 of a 1.0M solution of formic acid to prepare a buffer solution with pH=3.40? I have no clue how to work this out. Please help me.

Chem II - DrBob222, Monday, November 19, 2012 at 3:07pm
If you know how to use the Henderson-Hasselbalch equation that is the way to go. If not, let me know and it can be done another way.
Chem II - Bianca, Monday, November 19, 2012 at 5:44pm
Is it something like PH=pKa +log [base]/[acid]

3.40=??
How do I find the pKa?

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