Procedure:
1. All instruments were washed by using deionised water.
2. 25cm3 of sodium thiosulphate solution was pipetted out and pour into a volumetric flask.
3. Deionised water was added to the graduation mark.
Part A
1. Diluted sodium thiosulphate solution with unknown concentration was poured into the burette.
2. 25cm3 of standard 0.027M iodine solution was pipetted out and pour into a conical flask.
3. The iodine solution was titrated with sodium thiosulphate solution until it became pale yellow in colour.
4. Few drops of starch as indicator were added to the solution.
5. Titration was finished when the colour of the solution changed from blue to colourless.
6. Further 2 accurate titrations were performed.
Part B
1. All instruments were washed by using deionised water.
2. 1g of the solid manganese(â £) oxide was weighted and put into a conical flask.
3. 25cm3 of 1M potassium iodide was pipetted out and mixed with the solid.
Titration setup. The burette would normally be hel...
English: 30% hydrochloric acid
Hazmatspotting: UN 1789, "Hydrochloric acid"; UN 1...4. 20cm3 of 12M concentrated hydrochloric acid 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 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 wall of the flask.
12. Water was added with a wash bottle until the graduation mark and then shook well.
13. Diluted sodium thiosulphate solution (standardized 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...