[custard_crem]

Hi, I'm tabulating some results from a UV-vis spectrophotometer for university and a little unsure of one of the calculations.

I need to find the concentration (L^-1 mol) of [Cu(EDTA)]^2-. There were 0.15g of copper (II) acetate monohydrate and 0.4g of ethylenediaminetetraacetic acid dissolved in 0.1L of deionised water.

I've combined the moles/mass/Mr and concentration equations to give [itex]C = \frac {m}{(Mr × V)}[/itex]. My other calculations are fine but was wondering if on this one I would need to combine the masses and Mr both of copper (II) acetate monohydrate and ethylenediaminetetraacetic acid as it would be these two reacting together that would make the [Cu(EDTA)]^2- complex? So would the equation for this one be:

C =  __(m(Cu(CO₂CH₃)₂ ·H₂O) + m(EDTA))___
      (Mr(Cu(CO₂CH₃)₂ · H₂O) + Mr(EDTA)) × V

(for some reason it's not liking my LaTeX code for the above fraction, even though it works on the LaTeX practice box so I hope you understand/ see the fraction)

Or would you just use the m and Mr of Cu(CO₂CH₃)₂ · H₂O because it's the limiting reagent?

Thanks

[Borek]

Or would you just use the m and Mr of Cu(CO₂CH₃)₂ · H₂O because it's the limiting reagent?

Yes.