Chemistry

posted by .

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 -

    When you write the equation there is no "apparent" reaction; however, there is a redox reaction. Cu^+2 is reduced to Cu^+2 and I^- is oxidized to I2. Cu^+1 and I^- form a ppt of CuI. The yellow brownish color probably is iodine. You may not see all of this happening unless it is in a quite acid solution AND unless there is a large excess of KI; however, Cu makes an excellent primary standard for the standardization of thiosulfate solution (which are subsequently used to titrate liberated Iodine).

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chemistry

    Q1. What will be formed when propanone reacted with sodium hydrogensulphite?
  2. Chemistry: ketone and aldehydes

    Q1. What will be formed when propanone reacted with sodium hydrogensulphite?
  3. Chemistry

    Q1. What will be formed when propanone reacted with sodium hydrogensulphite?
  4. Chemistry

    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.
  5. Chemistry

    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.
  6. chemistry

    Question: When a pink aqueous solution of potassium permanganate, faintly acidified with dilute sulfuric acid was treated with 10% aq. hydrogen peroxide, the reaction took place with the evolution of gas bubbles, and the pink solution …
  7. Chemistry..

    1.What is going on at the atomic level if a precipitate forms in a double replacement reaction?
  8. Chemistry

    Mercury dissolves in concentrated nitric acid, with the evolution of a reddish-brown gas, just as in the reaction shown in figure 5.4 on page 188 for copper. The oxidation state of the mercury after reaction is +2. Write a balanced …
  9. Chemistry

    Mercury dissolves in concentrated nitric acid, with the evolution of a reddish-brown gas, just as in the reaction shown in figure 5.4 on page 188 for copper. The oxidation state of the mercury after reaction is +2. Write a balanced …
  10. Chemistry

    I have a question about solubility rules and net ionic equations so for example : CuSO4+Ba(NO3)2----->BaSO4+Cu(NO3)2 Okay so I know BaSO4 is insoluble while Cu(NO3)is solulable, that means BaSO4 will have a precipitate while Cu(NO3) …

More Similar Questions