Hey Steve,

In  class we did an experiment about iodine clock reactions.

We were asked at the end to fill out the initial concentrations of [I-] and [S2O8^2-]

 

So I wanted to know if I have to calculate those initial concentrations for th Reactants and how much (volume) we used in each experiment

 

Here was the chart that I used for the experiment:

 

Reactant                      Volume of Reactant (mL)

                                    EX 1      EX2     EX 3

0.200 M KI                 1.00       2.00       2.00

 

0.100 M K2S2O8       2.00      2.00       1.00

 

So what I am trying to figure out is, for the initial concentration would it be 0.200? Or I know we have to incorporate the different volumes we used.

Do I take the M (which is the molarity) and mulitply it by the volume in Litres to get the moles, then take the moles and divided that by the volume to get the mol/L?

That just seems like you would just leave it the way it is, because you multiply then divide, so that would cancel out.

 

Hopefully you can help!!!

THanks!