IGCSE chemistry
section 1e
mass conservation
Introduction
The
aim of this experiment is to show that mass is not gained or lost in a chemical
reaction.
What to record
Record
the total mass of the reactants and the products.
What to do
1. Measure approximately 5 cm3
of potassium iodide in the measuring cylinder and pour into one beaker.
2. Rinse the measuring
cylinder.
3. Measure approximately 5 cm3
of lead nitrate in the measuring cylinder and pour into another beaker.
4. Zero the balance then place
both beakers on the balance at the same time. Accurately measure their total
mass.
5. Take them off the balance.
6. Carefully pour the contents
of one beaker into the other making sure there is none spilt.
7. Zero the balance again, place
both beakers back on the pan and measure the mass.
Safety
Wear
eye protection. Solutions of lead compounds may be toxic – wash your hands
thoroughly at the end of the lesson.
Questions
1. Has a chemical reaction
occurred?
2. Complete the word equation:
potassium iodide + lead nitrate ®__________ + ___________
potassium iodide + lead nitrate ®__________ + ___________
3. Comment on your result.
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