Conservation of Mass Experiments
Conservation of Mass Experiment 1
Aim:
To investigate if mass is conserved in a chemical reaction.
Method A:
1. Read the instructions below and make a prediction of what will happen to
the weight
2. Add 20mL of Vinegar to the conical flask and weigh. Record your weight.
3. Weigh 2.0g of sodium bicarbonate on a watch glass.
4. Add the sodium bicarbonate to the conical flask and swirl until the
bubbling stops. Weight the flask and record the weight.
Results A:
Initial Weight of Conical flask and vinegar:
Initial Weight of sodium bicarbonate:
Total initial weight of flask, vinegar and sodium bicarbonate:
Total final weight of flask, vinegar and sodium bicarbonate:
Discussion Questions
 Compare the initial and final masses of each part of the experiment. Was
there a difference?
Conclusion:

How does this relate to the Conservation of Mass theory?
Conservation of Mass Experiment 2
Aim:
To investigate if mass is conserved in a chemical reaction.
Method B:
1. Read the instructions below and make a prediction of what will happen to
the weight.
2. Add 20mL of Vinegar to the conical flask and weigh it with the balloon.
Record your weight.
3. Weigh 2.0g of sodium bicarbonate on a watch glass.
5. Add the sodium bicarbonate to the conical flask and quickly cover the
opening of the flask with a balloon.
6. Swirl until the bubbling stops and weigh the flask and record this weight.
Results B:
Initial Weight of Conical flask and vinegar:
Initial Weight of sodium bicarbonate:
Total initial weight of flask, vinegar and sodium bicarbonate:
Total final weight of flask, vinegar and sodium bicarbonate:
Discussion Questions
 Compare the initial and final masses of each part of the experiment. Is
there a difference.
 How does this experiment support the Law of Conservation of Mass?