Gravimetric Analysis
SINGAPORE POLYTECHNIC
SCHOOL OF CHEMICAL & LIFE SCIENCES
CP 4001: ANALYTICAL & PHYSICAL CHEMISTRY
Experiment 4: Gravimetric Analysis
Prepared for:
Mr Goh Tong Hng
Submitted by:
Ng Hui Shan (0900931)
DBS/FT/1A/02
26th May 2009
CONTENTS
1. Synopsis 3
2. Objectives 4
3. Theory
1. Experimental Procedure 4
2. Stoichiometric Calculation 7
4. Procedure 7
5. Results & calculations
1. Amount of Sulphate 9
2. Percentage Yield 9
6. Discussions and recommendations
1. Accuracy of Results 11
2. Factors Affecting the Concentration of Sulphate 11
3. Measures to Improve Results 12
7. Conclusion 13
8. References 14
1. SYNOPSIS
The main objective of this experiment was to determine the amount of sulphate by a process called gravimetric analysis. Gravimetric analysis is the quantitative isolation of a substance by precipitation and the weighing of the precipitate. In this experiment, sodium sulphate was allowed to react with barium sulphate to form a white precipitate of barium sulphate. This precipitate was then washed, filtered and dried, to ensure that there are no impurities and water molecules present, before it was being weighed. The amount of sulphate obtained was calculated to be 0.2028g and the percentage yield was calculated to be 98.8%. Due to a number of experimental errors, this value is inaccurate. The percentage yield should be less than that because of the loss of sulphate ions during the experimental procedures. However, with the presence of impurities, the weight of sulphate obtained is greater. Therefore, measures should be taken to reduce the loss of sulphate ions and accumulation of impurities.
2. OBJECTIVES
The main objective of this experiment is to find out the amount of sulphate by using the gravimetric method. The other objectives are to learn
SCHOOL OF CHEMICAL & LIFE SCIENCES
CP 4001: ANALYTICAL & PHYSICAL CHEMISTRY
Experiment 4: Gravimetric Analysis
Prepared for:
Mr Goh Tong Hng
Submitted by:
Ng Hui Shan (0900931)
DBS/FT/1A/02
26th May 2009
CONTENTS
1. Synopsis 3
2. Objectives 4
3. Theory
1. Experimental Procedure 4
2. Stoichiometric Calculation 7
4. Procedure 7
5. Results & calculations
1. Amount of Sulphate 9
2. Percentage Yield 9
6. Discussions and recommendations
1. Accuracy of Results 11
2. Factors Affecting the Concentration of Sulphate 11
3. Measures to Improve Results 12
7. Conclusion 13
8. References 14
1. SYNOPSIS
The main objective of this experiment was to determine the amount of sulphate by a process called gravimetric analysis. Gravimetric analysis is the quantitative isolation of a substance by precipitation and the weighing of the precipitate. In this experiment, sodium sulphate was allowed to react with barium sulphate to form a white precipitate of barium sulphate. This precipitate was then washed, filtered and dried, to ensure that there are no impurities and water molecules present, before it was being weighed. The amount of sulphate obtained was calculated to be 0.2028g and the percentage yield was calculated to be 98.8%. Due to a number of experimental errors, this value is inaccurate. The percentage yield should be less than that because of the loss of sulphate ions during the experimental procedures. However, with the presence of impurities, the weight of sulphate obtained is greater. Therefore, measures should be taken to reduce the loss of sulphate ions and accumulation of impurities.
2. OBJECTIVES
The main objective of this experiment is to find out the amount of sulphate by using the gravimetric method. The other objectives are to learn