Please help if you can. Thank you The manganese-containing producta of the reduc

Question

Please help if you can. Thank you The manganese-containing producta of the reduction half reactións for the three pH conditions are: acidic: neutral: basic: Mn Mno2 Mnogreen very pale pink Manganese (II) ion Manganese dioxide Manganate ion brown The permanganate ion, Mno, is violet in color. Under each of the three pH conditions, the product of the reduction of the permanganate ion is a different color than the original permanganate ion (as shown in the table above). Therefore, the manganese-containing species acts as its own indicator during the oxidation-reduction titration. PRE-LAB QUESTIONS 1. Write balanced half reactions for the reduction of Mno" for each of the three pH conditions. 2. Por each of the three pH conditions, write a balanced net ionic ation for the overall redox process by combining each of the oxidation half reactions for the sodium bisulfite (given as equa- tions 1, 2, and 3 above) with the appropriate reduction half reac- tion for the permanganate ion (question 1). That is, add the acidic oxidation half reaction (equation 1) to the acidic reduction half reaction (from question 1), etc. Recall that, in order to add half reactions, the number of electrons given off in the oxidation process must equal the number of elec- trons taken up in the reduction process. EXPERIMENTAL PROCEDURE

Explanation / Answer

1)

Balanced equation for the reduction of MnO4- in acidic medium:

MnO4- + 8H+ + 5e- Mn2+ + 4H2O

Balanced equation for the reduction of MnO4- in basic medium:

MnO4- + e- MnO42-

Balanced equation for the reduction of MnO4- in neutral medium:

MnO4- + 2H2O + 3e- MnO2 + 4OH-

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