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March 29, 2017

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Is there a reaction between CuSO4 + KI? When I performed the reaction, a brown and yellow color was formed but when I wrote out the molecular equation, I did not find a precipitate or gas evolution.

  • Chemistry - ,

    answered above.

  • Chemistry - ,

    but why is there a reaction?

  • Chemistry - ,

    Its a redox reaction. The Cu^+2 is reduced to Cu^+1 and the I^- is oxidized to I2. Oxidation/reduction reactions take place if the potential of the cell produced is a positive voltage. The potential created by the reduction of Cu + the potential created by the oxidation of I2 is a positive voltage.

  • Chemistry - ,

    The reaction is
    2Cu^+2(aq) + 4I^-(aq) ==> 2CuI(s) + I2
    The yellow-brown color you saw was the I2. USUALLY that is so dark you can't see through the solution; however, I suspect you did not have a high excess of KI AND it wasn't acid enough so you only had a small amount of I2 produced.

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