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

Procedure: 1. each(prenominal) instruments were cleanseed by exploitation deionised water. 2. 25cm3 of atomic number 11 thiosulphate source was pipetted place and pour into a volumetric flaskful. 3. Deionised water was added to the offset sea gull. Part A 1. abridge sodium thiosulphate radical with vague concentration was poured into the burette. 2. 25cm3 of monetary specimen 0.027M iodine settlement was pipetted come out and pour into a cone-shaped flask. 3. The iodine resultant was titrated with sodium thiosulphate settlement until it became pale scandalmongering in colour. 4. Few drops of amylum as indicator were added to the base. 5. Titration was guileless when the colour of the resoluteness changed from unsanctified to colourless. 6. Further 2 destruction titrations were performed. Part B 1. All instruments were processed by using deionised water. 2. 1g of the solid manganese(?) oxide was backbreaking and put into a conic flask. 3. 25cm3 of 1M thousand iodide was pipetted out and integrate with the solid. 4. 20cm3 of 12M knockout hydrochloric acid was measurable by measuring cylinder. 5. The saturated 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 stirred gently. 8. The solution was poured into a 250cm3 volumetric flask. 9. The conelike flask was washed with small quantities of water. 10.

All washes were poured into the 250cm3 volumetric flask. 11. No solution was leave on the paries of the flask. 12. Water was added with a wash bottle until the graduation mark and then shook well. 13. reduce sodium thiosulphate solution (standardized in Part A) was poured into the burette. 14. 25cm3 of the thin out 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 slay in a safe essay, order it on our website: Ordercustompaper.com

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