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Student Worksheet LSM 13.4A Investigation 13.4 Analyzing a Hydrogen peroxide Solution REPORT CHECKLIST Purpose -Design Problem Me Hype Procedure Prediction • Evden • Analys • Eva (123) In this investigation, you assume the role of a laboratory technician working in a consumer advocacy laboratory, testing the concentration of a hydrogen peroxide solution. The labelled percent concentration of hydrogen peroxide on the commercial product is used for the Prediction Purpose The technological purpose of this investigation is to test and evaluate the percent concentration of the consumer solution of hydrogen peroxide Problem What is the percent concentration of hydrogen peroxide in a consumer product? Prediction Table 1 HO. Control Announ Parcot concentration concentration (mol/L 07 245 . 200 07 2.7 0.12 25 OBS 29 30 091 11 0.94 302 090 33 LO Design An acidic solution of the primary standard, iron(II) ammonium sulfatc-waler (1/6), is prepared and the potassium permanganate solution is standardized by a titration with this primary standard, A 25.0 mL sample of a consumer solution of hydrogen peroxide is diluted to 1.00L with water (that is, it is diluted by a factor of 40). The standardized potassium permanganate solution is used to titrate the diluted and acidified hydrogen peroxide. The amount concentration of the original hydrogen peroxide is obtained by analysis of the titration evidence, and by using a graph. prepared with a graphing calculator or computer spreadsheet program of the information in Table 1. Materials Lab apron eye protection FeSO(NH),SO 4611:0() 2 mol/L H,SO (aq) diluted Ho (4) KMnO (aq) Sulfuric acid is corrosive. Iron(II) ammonium sulfate, hydrogen peroxide, and potassium permanganate are irritants. Avoid inhaling any solid, and avoid skin or eye contact
Procedure le lab) Calculate the required mass of FeSOMH.80,4611,0(s) to prepare 100.0 mL of a 0.0500 mol/L solution Measure the required mass of the iron(II) compound in a clean, dry 100 ml beaker. 3. Dissolve the solid in about 40 mL or HSO (aq) 4. Transfer this solution into a clean 100 ml. volumetric flask, rinsing and adding pure water to complete the preparation of the standard solution 5. Transfer 10.00 mL or the standard iron Ll) solution by pipette into a clean 250 mL Erlenmeyer task. 6. Titrate the acidic iron(II) sample with KMnO (aq). 7 Repeat steps 5 and 6 until three consistent volumes (within 0.1 ml) are obtained. 8. Transfer 10.00 ml. of the diluted hydrogen peroxide solution by pipette into a clean 250 ml Erlenmeyer flash 9 Using a 10 ml. graduated cylinder, add 5 ml of H Sodaq) to the hydrogen peroxide solution 10. Titrate the acidic hydrogen peroxide solution with KMnO (aq) 11. Repeat steps 8 to 10 until three consistent volumes (within 0.1 ml.) are obtained 12. Dispose of all solutions into a labelled waste container Evidence mass of FeSO,(NH.),SO,•6H:0 (s) to prepare 100.0 mL of solution Table 1 Titration of 10.00 mL of Acidic Iron(II) Standard with KMnO.() final burette reading (ml) 16.50 21.90 4.20 initial burette reading (ml) .60 26.40 25 volume of KMnO4(aq) (mu) 12.9 12-35 12.2 endpoint colour I light Pake Madumank Table 2 Titration of 10.00 ml. of Acidified, Diluted HO- (aq) with KMnOdag) Trial 2 final burette reading (ml) 12.29 23.15 34.6 initial burette reading (ml) 12.29 25. volume of KMnO (aq) (mL) Izalt 10.86 10.4 endpoint colour Medium think Itantly Pax Fountly Ank 2 Trial 30.4 3.70 What man Analysis amount concentration of potassium permanganate solution: amount concentration of diluted hydrogen peroxide solution:
amount concentration of original hydrogen peroxide solution: percent concentration of original hydrogen peroxide solution: Amount and Percent Concentrations for H2O2(aq) 1.00 0.95 0.90 0.85 Amount concentration (mol/L) 0.80 0.75 0.70 25 2.6 27 3.2 33 3.4 2.8 2.9 3.0 3.1 Percont concentration (96) Evaluation
Questions What is the purpose of adding HySOu av to the Fe?" (aq) solution before titrating with KMnO4(aq)? Why not add the H-SO.(aq) to the KMnO (aq)? 2. In the procedure (Part B. Step 1) instructions, you were to use a dry 100ml beaker. Why is it important that the beaker be dry? Is it also necessary that the Erlenmeyer flask used in Part B. Step 3 be dry? Explain. 3. What chemical species serves to indicate the endpoint of these reactions? 4. In an experiment similar to Lab M2, 0.0500 mol/L K2Cr2O7(aq) was used in an acidic solution to oxidize Fe?(aq) ions to Fe(q) ions. The following data were obtained. volume of Fema) solution 25.0 mL final buret reading (K.Ct.O(aq)). 48.7mL Initial buret reading 3.7 mL What was the concentration of the Fe*(aq) ions in the solution? (The above is part of the iron analysis of an iron ore sample.) 5. In another experiment similar to Lab M2, the Sn"(aq) ions in an acidic solution were oxidized to Sn" (aq) by a 0.200 mol/L KMnO (aq) solution. The following data were obtained. volume of Sn"(aq) solution 10.0 mL final buret reading (KMnO (aq)) 39.3 mL Initial buret reading (KMnO.(aq)) 1.8 ml Wat was the concentration of Sn"(aq) in the solution? (The above is part of the tin analysis of a tin ore sample.)