Investigation 13.4 Analyzing a Hydrogen peroxide Solution REPORT CHECKLIST Purpose Design Problem Materials Hypothesis P

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Investigation 13 4 Analyzing A Hydrogen Peroxide Solution Report Checklist Purpose Design Problem Materials Hypothesis P 1 (54.31 KiB) Viewed 34 times

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Investigation 13.4 Analyzing a Hydrogen peroxide Solution REPORT CHECKLIST Purpose Design Problem Materials Hypothesis Procedure • Prediction • Evidence • Analysis • Evaluation (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 Table 1 H,0.) Concentration Amount Percent concentration concentration (mol/L) 073 25 0.76 26 079 27 0.82 29 29 085 0.88 3.0 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 31 0.91 0.94 3.2 0.97 10 34 Design An acidic solution of the primary standard, iron(!) ammonium sulfate-water (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 1.00 L 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 2 mol/L. H.SO (aq) eye protection diluted H:O:(aq) FeSO:-(NH.) SOH611:0(5) 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 1. (Pre-lab) Calculate the required mass of FeSO4-NH),SO-6H,0(s) to prepare 100.0 ml. of a 0.0500 mol/l solution 2. Measure the required mass of the iron(II) compound in a clean dry 100 ml beaker 3. Dissolve the solid in about 40 ml. of H.SO (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 of the standard iron(II) solution by pipette into a clean 250 ml. Erlenmeyer flask 6. Titrate the acidic iron(II) sample with KMnO (ag), 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 flask 9. Using a 10 ml. graduated cylinder, add 5 ml. of H.SO daq) 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. i 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(IT) Standard with KMnO (aq) final burette reading (mL) 19.50 420 initial burette reading (ml) 370 5.50 20.40 volume of KMnO(aq) (m) 12.9 12.2 endpoint colour Madinak light for light Pink Trial 2 3 21.00 38.4 2 12.3 34.5 Table 2 Titration of 10.00 mL of Acidified, Diluted H 0 (ag) with KMnO (aq) Trial final burette reading (ml) 1229 23.15 initial burette reading (ml) 12.29 volume of KMnO (09) (ml.) 12.5 10.86 endpoint colour Madison hak 25.+ 10.4 Fantly Make Fointly Ank 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 H,O,Cam) 1.00 0.95 0.90 Amount concentration (mol/L) 0.85 0.80 0.75 0.70 2.5 2.6 32 3.3 3.4 2.7 2.8 2.9 3.0 3.1 Percent concentration (%) Evaluation
Questions 1. What is the purpose of adding H Sacaq) to the Fe? (aq) solution before titrating with KMnO (aq)? Why nor 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 K CruO3(aq) was used in an acidic solution to oxidize Fe?*(aq) ions to Fe*aq) ions. The following data were obtained. volume of Feng solution 25.0 mL final buret reading (K,C1,07(2). 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.) 2- 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 KMnO4(aq) solution. The following data were obtained. volume of Sn** (aq) solution ... 10.0 mL final buret reading (KMnO2(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.)