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August 20, 2014

Homework Help: chem

Posted by Rebekah on Sunday, April 10, 2011 at 7:19pm.

Which of the following pairs of substances, when mixed in any proportion you wish, can be used to prepare a buffer solution? (Select all that apply.)

NaCN and HCN
NaCN and NaOH
HCN and NaOH
HCl and NaCN
HCl and NaOH

I thought it was the middle three because each either has a strong base or strong acid but its wrong.

How are you suppose to know?
thans

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