Homework Help: A.P. Chemistry

Posted by Oli on Saturday, April 3, 2010 at 4:31pm.

You have solutions of 0.200 M HNO2 and 0.200 M KNO2 (Ka for HNO2 = 4.00  10-4). A buffer of pH 3.000 is needed. What volumes of HNO2 and KNO2 are required to make 1 liter of buffered solution?

A.P. Chemistry - DrBob222, Saturday, April 3, 2010 at 4:49pm
Use the Henderson-Hasselbalch equation.
pH = pKa + log[(base/acid)]
A.P. Chemistry - Oli, Saturday, April 3, 2010 at 4:51pm
Howw? How does it apply? I kinda forgot over spring break... How do you find the volume that you need?
A.P. Chemistry - bobpursley, Saturday, April 3, 2010 at 5:14pm
in the log part, what dr Bob wrote as log(base/acid), base means concentration of the base, and acid means concentration of acid. concentration is moles/volume. Your two volumes will add to 1 liter.

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