To determine the % by mass of manganese (IV) oxide in a solid sample. ( By Titration )

Procedure: 1. altogether instruments were cleanseed by using deionised water. 2. 25cm3 of atomic number 11 thiosulphate bug was pipetted come place of the closet and pour into a volumetric flaskful. 3. Deionised water was added to the scratch line mark. Part A 1. thin sodium thiosulphate radical with unknown concentration was poured into the burette. 2. 25cm3 of monetary standard 0.027M iodine settlement was pipetted out and pour into a conical flask. 3. The iodine resultant was titrated with sodium thiosulphate solution until it became pale jaundiced in colour. 4. Few drops of starch as indicator were added to the solution. 5. Titration was sinless when the colour of the solution changed from ghastly to colourless. 6. Further 2 close titrations were performed. Part B 1. All instruments were water-washed by using deionised water. 2. 1g of the solid manganese(?) oxide was leaden and put up into a conical flask. 3. 25cm3 of 1M potassium iodide was pipetted out a nd fuse with the solid. 4. 20cm3 of 12M toilsome hydrochloric panelling was measured by measuring cylinder. 5. The concentrated hydrochloric acid was mixed with the solid. 6. 25cm3 of 1M potassium iodide was pipetted out and mixed with the solid. 7. The solution was stir gently. 8. The solution was poured into a 250cm3 volumetric flask. 9. The conical flask was washed with small quantities of water. 10.

All washes were poured into the 250cm3 volumetric flask. 11. No solution was afford on the wall of the flask. 12. Water was added with a wash bottleful until the graduation mark and then shook well. 13. Diluted sodium thiosulphate solution (standardized i! n Part A) was poured into the burette. 14. 25cm3 of the diluted solution was pipetted out and poured into a conical flask. 15. The diluted solution was titrated with diluted sodium thiosulphate solution until a pale yellow... If you want to take in a full essay, order it on our website: BestEssayCheap.com

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