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

Procedure: 1. whole instruments were cleanseed by using deionised water. 2. 25cm3 of atomic number 11 thiosulphate character reference was pipetted break through and pour into a volumetric flaskful. 3. Deionised water was added to the kickoff mark. Part A 1. thin sodium thiosulphate radical with undiscovered concentration was poured into the burette. 2. 25cm3 of monetary standard 0.027M iodine settlement was pipetted pop 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 stiffen as indicator were added to the solution. 5. Titration was sinless when the colour of the solution changed from raunchy to colourless. 6. Further 2 close titrations were performed. Part B 1. All instruments were swear out by using deionised water. 2. 1g of the solid manganese(?) oxide was leaden and repose into a conical flask. 3. 25cm3 of 1M potassium iodide was pipetted o ut and fuse with the solid. 4. 20cm3 of 12M beaut hydrochloric acrimonious 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 randy 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 will on the wall of the flask. 12. Water was added with a wash bottle until the graduation mark and then shook well. 13. Diluted sodium thiosulphate solu tion (standardized in Part A) was poured int! o 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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