This is a practice problem. Experiment 1. Assay of Hydrogen Peroxide SolutionPrinciple:Direct permanganometryThe percentage purity of hydrogen peroxide set by the USP is 2.5 – 3.5 g/100 ml.Procedure (whole formulation; three trials)1. Pipet 2 milliters of hydrogen peroxide solution into a suitable flask containing 20 militers of water. (H;O2 p = 1.45 g/ml)2. Add 20 milliliters of diluted sulfuric acid3. Titrate with 0.1 N potassium permanganate solution, wherefor each trial is provided in the table below).ml was consumed (the theoretical volume consumedNI ml x meg4. Calculate the percentage purity of the sample, using the formula:% =x 100 %wtReaction (fill in the coefficients on the blank spaces):_H2O2 +_ KMNO4 +_ H2SO4 → _O2 +_ MNSO4 + _ K2SO4 + _ H2oOxidation: Reducing Agent H2*1022O20 + 2H +_e-Reduction: Oxidizing Agent Mn*O2 + 8H +.e- Mn*7 + 4H2ONumber of e- gain/loss of oxygen is; which is the factor hydrogen peroxide-Data and Results:Trial 1Trial 2Trial 3Weight of H2O2Volume of KMNO.Percentage purityAverage percentage purity43 ml42.8 ml43.5 mlCalculation and ConclusionOn space below, solve the titer value and average percentage purity of the sample then interpret.

Given: Volume of H2O2 = 2.0 mL density of = 1.45 g/mL Concentration of KMnO4 = 0.1 N

Principle: Direct permanganometry The percentage purity of hydrogen peroxide set by the USP is 2.5 – 3.5 g/100 ml. Procedure (whole formulation; three trials) 1. Pipet 2 milliters of hydrogen peroxide solution into a suitable flask containing 20 milliters of water. (H;O2 p = 1.45 g/ml) 2. Add 20 milliters of diluted sulfuric acid 3. Titrate with 0.1 N potassium permanganate solution, wheremi was consumed (the theoretical volume consumed for each trial is provided in the table below). 4. Calculate the percentage purity of the sample, using the formula: NI mi x meg 100 % % = Reaction (fil in the coefficients on the blank spaces): _H2O2 +_ KMNO4 + _ H;SO4 →_ O2 + _ MNSO, + _ K2SO4 + _ H20 Oxidation: Reducing Agent H2*1022 → 0,0 + 2H +_• Reduction: Oxidizing Agent Mn*70r² + 8H + _* → Mn*7 + 4H2O * Number of e- gain/loss of oxygen is, ; which is the factor hydrogen peroxide Data and Results: Trial 1 Trial 2 Trial 3 Weight of H:Oa Volume of KMNO, Percentage purity Average percentage purity 43 ml 42.8 ml 43.5 ml Calculation and Conclusion

Principle: Direct permanganometry The percentage purity of hydrogen peroxide set by the USP is 2.5 – 3.5 g/100 ml. Procedure (whole formulation; three trials) 1. Pipet 2 milliters of hydrogen peroxide solution into a suitable flask containing 20 milliters of water. (H;O2 p = 1.45 g/ml) 2. Add 20 milliters of diluted sulfuric acid 3. Titrate with 0.1 N potassium permanganate solution, wheremi was consumed (the theoretical volume consumed for each trial is provided in the table below). 4. Calculate the percentage purity of the sample, using the formula: NI mi x meg 100 % % = Reaction (fil in the coefficients on the blank spaces): _H2O2 +_ KMNO4 + _ H;SO4 →_ O2 + _ MNSO, + _ K2SO4 + _ H20 Oxidation: Reducing Agent H21022 → 0,0 + 2H +_• Reduction: Oxidizing Agent Mn70r² + 8H + _* → Mn7 + 4H2O Number of e- gain/loss of oxygen is, ; which is the factor hydrogen peroxide Data and Results: Trial 1 Trial 2 Trial 3 Weight of H:Oa Volume of KMNO, Percentage purity Average percentage purity 43 ml 42.8 ml 43.5 ml Calculation and Conclusion

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter31: Introduction To Analytical Separations

Section: Chapter Questions

Problem 31.19QAP

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