1. Mass Percent of Oxygen in Potassium Chlorate

2. Chemistry
Name________________
Block_____Date_____
Mass Percent of Oxygen Name(s) of Lab Partner(s)
In Potassium Chlorate

3. Objective
To calculate the mass percent of oxygen in potassium chlorate

4. Procedure Add a small amount of catalyst to a test tube
Record the mass of the test tube and catalyst
Put 2 scoops of KClO3 in test tube and mass again and mix
Heat the test tube with a burner until no more oxygen is seen

5. Procedure, con Continue to heat another 2-3 minutes
Record your observations- allow to cool
Mass the test tube and products
Calculate the percent oxygen in potassium chlorate

6. Data Mass of test tube and catalyst ___
Mass of test tube, catalyst and KClO3 ___
Mass of test tube and products ___
Observations (you must make)

7. Calculations
Percent of oxygen in KClO3
(skip 6 lines)

8. Actual percent of oxygen in KClO3 (skip 6 lines)
Percent error
Percent error = % in your exp – actual % X = %
actual %

9. Conclusion
The mass percent of oxygen in potassium chlorate according to my lab was ________. The actual value using the gram formula weight is ___________. My percent error is _________. Reasons for error include… (list 3 + two more sentences about lab)