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(CO_{2}CH_{3})_{2 }·H_{2}O) + m(EDTA))___

(Mr(Cu(CO_{2}CH_{3})_{2} · H_{2}O) + 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(CO_{2}CH_{3})_{2} · H_{2}O because it's the limiting reagent?

Thanks