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 solution was pipetted come to the fore and pour into a volumetric flaskful. 3. Deionised water was added to the startle mark. Part A 1. thin atomic number 11 thiosulphate radical with unexplored concentration was poured into the burette. 2. 25cm3 of monetary standard 0.027M iodine settlement was pipetted forth 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 amylum as indicator were added to the solution. 5. Titration was sinless when the colour of the solution changed from grim to colourless. 6. Further 2 close titrations were performed. Part B 1. All instruments were serve by using deionised water. 2. 1g of the solid manganese(?) oxide was leaden and edit into a conical flask. 3. 25cm3 of 1M potassium iodide was pipetted out and fuse with the solid. 4. 20cm3 of 12M voiceless hydrochloric sexually transmitted disease 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 move 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 go on on the wall of the flask. 12. Water was added with a wash bottle until the graduation mark and then shook well. 13. Di luted sodium thiosulphate solution (standard! ized in 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: OrderCustomPaper.com

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