[faith]

What would be the consequence if the unknown you used had quinine dihydrochloride instead of quinine sulfate?

[Arkcon]

Yes.







Oh, I'm kidding.    I want to tell you two things.  First of all, you've given us very little context, so it's hard for us to answer.  Also, you'll learn more if you offer some ideas.  I'm guessing the lab write-up asked this question, and you're probably expected to come up with an answer yourself.  Giving it all away would be unfair, to you and your classmates.

[ARGOS++]

Dear faith;

But it's only my guess and I don't know anything about your unknown:
 
Qualitatively I think there should be nearly no difference for the quinine itself, because the quinine-ion remains in the "same state" as both are very strong acids.

Quantitatively I see some small differences for the quinine itself, because the number of ions per quinine-ion has changed, and so its activity will be different in both solutions.

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