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## Homework Statement

Well we have this lab on equilibrium using titration.

I found the lab here http://wikieducator.org/Chemistry/Equilibrium_Titration" [Broken]

So I'm kinda stuck on number 3c, where it asks what is the starting concentration of Fe

^{3+}. I don't know if I did number 3b right either...

## Homework Equations

Everything is on that webpage.

## The Attempt at a Solution

1a) 0.05 M

b)0.05 M

2)0.0013 mol ( volume of KSCN used was 13mL)

3a) n

_{Ag}=n

_{KSCN}

= 0.0013 mol

For 3b) what I did was take the starting moles and subtracted the end number of moles. So I calculated that there were 0.003mol in the starting solution of 0.05M Ag

^{+}and then 0.00013mol of Ag

^{+}at equilbrium. I then got 0.0017mol as the moles at equilibrium. It is the concentration that I'm not really sure to what I'm doing. So what I did was take 0.05M (concentration of diluted Ag) and then subtracted the concentration of Ag at equilibrium. For the equilibrium concentration, I put 0.0013mol / (0.05L + 0.05L + 0.013L) but I dont think this is right.. What should I do here?

For 3c, would the starting amount of Fe

^{3+}be zero?

Any help will be appreciated. Thanks.

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