The reaction of MnO4^- with I^- in basic solution. A) The ultimate product that

Question

The reaction of MnO4^- with I^- in basic solution.

A) The ultimate product that results from the oxidation of I^- in this reaction is IO3^-. Although your observations will not prove that this colorless ion was formed, show that your results indicate that I2 was not formed?

B) The color of the aqueous layer will enable you to deduce the unambiguous product from the reduction of MnO4^-. What is that product?

C) Write the balanced equation for the reaction?

D) How do the reactions in acidic and basic solutions difer?

Explanation / Answer

(A)       In the basic medium the product is MNO2 and I2

(B)       When MnO2 and IO3- form then the aqueous solution will be colorless

(C)       The balanced equation for the reaction in basic medium is given below.

            6 I- + 2MnO4- + 4H2O = 3 I2 + 2MnO2 + 8OH-

(D)       The balanced equation for the reaction in acidic medium is given below. The end products are

different.

            2MnO4-(aq) + 2H+(aq) + I-(aq) = 2MnO2(s) + IO3-(aq) + H2O(l)

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