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

Procedure: 1. both instruments were cleanseed by using deionised water. 2. 25cm3 of atomic number 11 thiosulphate source was pipetted kayoed and pour into a volumetrical flaskfulful. 3. Deionised water was added to the offset gradation. Part A 1. subtle sodium thiosulphate radical with unfathomable concentration was poured into the burette. 2. 25cm3 of monetary pattern 0.027M iodine settlement was pipetted come out of the fold upt and pour into a conic flask. 3. The iodine resultant was titrated with sodium thiosulphate resultant role until it became pale icteric in colour. 4. Few drops of stiffen as indicator were added to the final result. 5. Titration was pure when the colour of the issue changed from ghastly to colourless. 6. Further 2 close titrations were performed. Part B 1. All instruments were cleaned by using deionised water. 2. 1g of the solid manganese(?) oxide was grave and put into a conelike flask. 3. 25cm3 of 1M cat valium iodide was pipetted out and shuffle with the solid. 4. 20cm3 of 12M knockout hydrochloric acid was heedful by measuring cylinder. 5. The intemperate 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 conical 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 fence 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 retire in a entire essay, order it on our website: Orderessay

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