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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: Fragment_Error on October 02, 2006, 01:35:18 AM

Title: Concentrations of reactions.
Post by: Fragment_Error on October 02, 2006, 01:35:18 AM

Ok, I need to find out the initial concentration of a reaction after mixing.

It is KI -> Na₂S₂O₃

The molarity of KI is 0.2 and the Volume was 20cm³

Now in my question it has:

For [KI]_ln

M_KI x V_KI = [KI]_ln x 50cm³

Which would mean:

0.2 x 20 = 4 x 50

= 200M

Which can't be right.

I know I'm missing something here, and just need a little help.

Title: Re: Concentrations of reactions.
Post by: Borek on October 02, 2006, 02:47:41 AM

Quote from: Fragment_Error on October 02, 2006, 01:35:18 AM

Which can't be right.

That's the only thing we agree.

Please explain what's the question/experiment and start with properly written and balanced chemical reaction. Then someone can be of some help.

Title: Re: Concentrations of reactions.
Post by: AWK on October 02, 2006, 04:37:05 AM

Product

Quote

0.2 x 20 = 4 x 50

= 200M

is in milimoles
(for moles you should use volumes of solution  in liters)