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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: antimatter101 on December 19, 2012, 10:25:59 PM

Title: green solution
Post by: antimatter101 on December 19, 2012, 10:25:59 PM

Which one of these have a green solution? Cupric citrate, cuprous citrate, cupric tatrate, or cuprous tartrate? Please let me know.

Title: Re: green solution
Post by: Hunter2 on December 20, 2012, 01:00:02 AM

Cu(H₂O)₄²⁺ are blue. Do Cu⁺ exist with citrate or tartrate? Coppercitrate have some green colour.

Title: Re: green solution
Post by: antimatter101 on December 20, 2012, 04:46:56 AM

Which copper citrate? Cupric or cuprous?

Title: Re: green solution
Post by: Hunter2 on December 20, 2012, 05:50:05 AM

Cu²⁺ because Cu⁺ is not existing there. Cu⁺ exist in my opinion only as oxide, sulfide and (pseudo)halogenide.

I am not sure if citric or tatratic can complex such kind of things.

Title: Re: green solution
Post by: antimatter101 on January 01, 2013, 03:35:23 AM

By the way, it is dark green. When more water evaporated it even looked a bit yellow.

Title: Re: green solution
Post by: kaliaden on January 04, 2013, 03:15:36 PM

Cupric salts can show both blue and green solutions as well especially in the presence of chloride ions due to formation of the [CuCl₄]^2- ion.

I don't think it is a cuprous salt since Cu⁺ is unstable in solution and almost all cuprous compounds are insoluble.

Again.. cupric citrate is supposed to be insoluble.
Cupric tartrate is highly soluble since the tartrate ions form a stable complex with copper. So it is most likely cupric tartrate although I'm not absolutely sure...