4
F1a
4.4
Cleaning up grease stains
Two pupils were given a sample of vinegar and a sample of sodium
hydrogen carbonate (sodium bicarbonate) solution. They investigated
how the two substances compared in removing grease stains.
Our report
1 We put vinegar into one bowl and sodium hydrogen
carbonate solution into another bowl. We added water.
2 We put some grease-stained cloth into each bowl.
3 We left the bowls for 30 minutes and then dried out
the cloth and saw what happened.
Look at their report
1 Give one way they made their investigation fair. (Level 4)
2 Give two ways they could improve their investigation. (Level 5)
3 What should they observe to compare the two types of cleaning
substance? (Level 5)
One of the pupils found a bottle of sodium hydroxide in the laboratory
with the following hazard warning symbol on it.
4 Why would it not have been a good idea to use this alkali
instead of the sodium hydrogen carbonate? (Level 6)
5 Sodium hydoxide is used to clean drains. Suggest why
this works and the safety precautions you would need to
take when handling it. (Level 6)
Go Science! 1 © Pearson Education Limited 2008
This worksheet may have been altered from the original.
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