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Booklet to help with Unit 27

Booklet to help with Unit 27. P6 M4 D3. For P6 you need to………. Carry out Iron sulfate titration AND do its calculations Describe the method of the Iron sulfate titration and the calculations carried out Carry out Sodium thiosulfate titration AND do its calculations

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Booklet to help with Unit 27

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  1. Booklet to help with Unit 27 P6 M4 D3

  2. For P6 you need to………. • Carry out Iron sulfate titration AND do its calculations • Describe the method of the Iron sulfate titration and the calculations carried out • Carry out Sodium thiosulfate titration AND do its calculations • Describe the method of the Sodium thiosulfate titration and the calculations carried out

  3. Task 1: • Carry out titration of iron sulfate with potassium manganate and carry out calculations for the practical

  4. Results to iron sulfate titration

  5. Task 2: Describe the method of the iron sulfate titration and calculations • The method described must be in full sentences and in past tense. • You must describe the calculations you carried out which were used to determine the concentration of iron sulfate

  6. Task 3: • Carry out titration of sodium thiosulfate with iodine and carry out calculations for the practical

  7. Results to sodium thiosulfate titration

  8. Task 4: Describe the method of the sodium thiosulfate titration and calculations • The method described must be in full sentences and in past tense. • You must describe the calculations you carried out used to deduce the reaction equation with the actual No of moles used

  9. For M4 you need to • Explain the procedure of the titration of potassium manganate(VII) and iron sulfate, in terms of the oxidation states of the substances involved • Explain the procedure of the titration of sodium thiosulfate and iodine, in terms of the oxidation states of the substances involved

  10. potassium manganate(VII) and iron sulfate titration • The half equation for reduction: Fe3+ (aq) + e- Fe2+ (aq) • The half equation for oxidation: MnO4-(aq) + 8H+ (aq)  Mn2+ (aq) + 4H20 (l) • The overall chemical equation for the reaction is: MnO4- (aq) + 8H+ (aq) + 5Fe2+ (aq)  Mn2+ (aq) + 5Fe3+ (aq) + 4H20 (l)

  11. Task 5: Explain the procedure of the titration of potassium manganate(VII) and iron sulfate, in terms of the oxidation states of the substances involved • Your explanation must be in FULL sentences. • You need to state what the oxidation Numbers are • You need to Identify what is being reduced and oxidised • You need to include accurate chemical oxidation and reduction equations

  12. sodium thiosulfate and iodine titration • The half equation for reduction: I2(aq) + 2e- 2I- (aq) • The half equation for oxidation: 2S2O32-(aq) S4O62-(aq) + 2e- • The overall chemical equation for the reaction is: 2Na2S2O3 (aq) + I2 (aq)  2NaI (aq) + Na2S4O6 (aq)

  13. Task 6: Explain the procedure of the titration of sodium thiosulfate and iodine, in terms of the oxidation states of the substances involved • Your explanation must be in FULL sentences. • You need to state what the oxidation Numbers are • You need to Identify what is being reduced and oxidised • You need to include accurate chemical oxidation and reduction equations

  14. For D3 you need to Explain three examples of where the redox titrations discussed in P6/M4 (or similar redox titrations) are used in industry. Suitable examples that you may use but are not restricted to use include: • Analysis of household bleach • Analysis of iron tablets • Extracting metal ore • Analysing Vitamin C

  15. For each REDOX titration example in industry you must….. • Research into the example • State what the analyte is and WHY it is being analysed • Include a basic method • Include chemical equations involved • Identify what is being reduced and oxidised

  16. Analysis of household bleach • Titration can be used to confirm the concentration of sodium hypochlorite that is present in household bleach • The bleach is treated with iodine, and then titrated with sodium thiosulfate using starch to indicate when the end point has been reached

  17. Analysis of iron tablets • This titration forms the basis of an analytical technique for the estimation of iron which can be used to confirm the amount of iron in iron tablets • The iron tablets are grinded up and made up to solutions using sulfuric acid to dissolve all the iron ions. They are then titrated with Manganate solutions (e.g. potassium manganate)

  18. Analysis of vitamin C • Titration can be used to determine the amount of vitamin C in food/drinks. (E.g. which fruit has more vitamin C? Does frozen or tinned vegetables have more vitamin C?) • The vitamin C is titrated with Triiodide. Triiodideoxidises vitamin C (also known as ascorbic acid) to form dehydroascorbic acid

  19. Task 7: Research and explain three examples of where the redox titrations are used in industry For each example you must • State what the analyte is and WHY it is being analysed • Include a basic method • Include chemical equations • Identify what is being reduced and oxidised

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