[cyclopentadienyl]

Hello

I hope you are able to help me. This is my task: Copper(I) oxide is suspended in a solution of Cu(II) ions (c(Cu(II))=0.01 mole/l, temperature 20 °C [68 °F], Ksp(CuOH)=1.0*10^-15).
Calculate the pH value form copper(I) oxide is stable in aqueous solution. Does the temperature have an influence to the pH?
It would be enough if you could provide me with the correct equation(s).

I thank you very much in advance.

cyclopentadienyl

[billnotgatez]

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[cyclopentadienyl]

Hello billnotgatez

Sorry for that.
I know that copper(I) oxide which is dissolved in water forms Cu(I) ions as well as extremely reactive O^2- ions. These ions react with water to OH^- ions which change the pH value. So, the solubility of salts depends on the pH.
Cu2O + H2O  Cu⁺ + 2OH^-

Furthermore: Kps=c(Cu(II))*c(Cu(I))²
                   c(CU(I))=sq root[Kps/c(Cu(II))].

                   c(Cu(I))=3.16*10^-7 mole/l