Be sure to answer all parts. The concentration of a hydrogen peroxide solution c

Question

Be sure to answer all parts. The concentration of a hydrogen peroxide solution can be conveniently determined by titration against a standardized potassium permanganate solution in an acidic medium. (a) Balance this redox equation (in acidic solution) by inserting coefficients, H+, and H2O as needed. (Do not enter the physical states of any of the species.) MnO4 + H2O2 O2 + Mn2+ (b) If 32.95 mL of a 0.03852 M KMnO4 solution are required to completely oxidize 24.00 mL of a H2O2 solution, calculate the molarity of the H2O2 solution. M

Explanation / Answer

a) 2Mno4^- + 5H2O2 + 6H^+ 5O2 + 2Mn^2+ + 8H2O

b) ? molKMno4 = 32.95mL * 0.03852 mol KMno4 / 1000 mL sol =0.00127 mol KMno4

? mol H2O2 = 0.00127 mol KMno4 * 5mol H2O2 / 2mol KMno4 = 0.003175 mol H2O2

molarity of H2O2 = 0.003175 mol H2O2 / 0.02400 L = 0.1322 M

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