[aillee]

I don't understand what the difference between a Standard Solution and a Secondary Standard Solution is.

I've been told one's been titrated against and then I've been told they're both the same...
 

[ARGOS++]

Dear aillee;

Most people use both terms interchangeable, because almost all standards we use are of second or “higher” order.
To understand that you have also to know what primary standards are:
          http://www.chemicalforums.com/index.php?topic=20389.0

I hope to have been of help to you.
Good Luck!
                    ARGOS⁺⁺