the concentration of hydrogen peroxide in a solution can be determined by titrat

Question

the concentration of hydrogen peroxide in a solution can be determined by titration with permanganate solution in an acidic solution. Determine the oxidation and reduction half reactions and the overall net reaction for the reaction: H2O2 + MnO41- = Mn2+ + O2 in an acidic solution First determine the oxidation states for each atom in the above reaction. Answer 1. hydrogen in H2O2 2. oxygen in H2O2 3. oxygen in MnO41- 4. manganese in MnO41- 5. Manganese (II) ion, Mn2+ 6. Oxygen in O2 Possible answers A. -1 B. +1 C. 0 D. +7 E. -2 F. +3 G. +4 H. +2 I. +6

Explanation / Answer

H2O2-->O2+ 2H+ +2e-

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

5 H2O2 + 2 MnO4- + 6 H+ = > 2 Mn+2 + 5 O2+ 8 H2O

b) 2 moles of the permanganate r/w 5 moles of the peroxide

mole of permanganate at the eq point = .025*14.65 /1000

= 3.66 * 10 ^ -4 moles

moles of H2O2 at the eq point = 9.15 * 10 ^ -4 ( *5/2)

mass of H2O2 = 3.1 * 10 ^ -2 grams ( * 34)

% H2O2 = 1.6 % ( / 1.900 * 100)

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