[vonc01]

I have this lab due tomorrow and I'm a bit confused on calculating the concentrations.

Background: 

It was a 2 stage reaction equations are as followed:

(1) Io₃^-_(aq) + 3HSO₃^-_(aq)  I ^-_(aq) + 3SO₄^2-_(aq) + 3H⁺_(aq)
(2) 5I^-_(aq) + 6H⁺_(aq) IO₃^-_(aq) 3I_2(aq) + 3H₂O

We had  had 2 Solutions named A and B, we're given that Solution A has IO₃^- ion and Solution B has  3HSO₃^- ion and soluble starch.

We would then mix A and B (10 mL each) thoroughly and time how long it would take to react, we repeated this multiple times diluting Solution A with distilled water with ratios of 9:1, 8:2, and so on to 5:5.  My teacher wants me to find the concentration of IO₃^- ions in the 20 mL mixture we created, and I have zero clue where to start.  Thanks for any help.

[Borek]

http://www.chembuddy.com/?left=concentration&right=dilution-mixing