A stoppered test tube contains carbon dioxide from a reaction. A few drops of limewater are added, the stopper is replaced and the test tube is shaken. Describe what would you see.
Answers
Apparatus and chemicals
Conical flask with side arm, thistle funnel, delivery tube
3 gas jars with lids (or test tubes with stoppers)
Basin/trough of water
Test-tube rack
Calcium carbonate small pieces 3 g
50 cm3 of hydrochloric acid 1 mol/dm3
Wooden Splint
Limewater 5 cm3
Universal indicator solution
Method
Carefully place the calcium carbonate into the conical flask.
Collect 50 cm3 of hydrochloric acid in a small beaker.
Connect the delivery tube and thistle funnel to the conical flask with the delivery tube in a basin of water.
Have three gas jars/test tubes filled with water also inverted in the basin of water.
Carefully pour the hydrochloric acid into the thistle funnel, wait 5 s then carefully place the first water filled gas jar/test tube over the end of the delivery tube. Allow the gas jar/test tube to fill with gas (when all of the water has been displaced).
Leave the gas jar/test tube inverted in the water to retain the gas.
Repeat step 5 until three gas jars/test tubes of gas have been collected.
Remove each gas jars/test tube from the water as required for the following tests.
Testing the gas
To the first gas jar/test tube insert a lit splint – record your observations.
To the second gas jar/test tube add 1 cm3 of limewater, stopper and shake – record your observations.
To the third gas jar/test tube add 5 drops of universal indicator, stopper and shake – record your observations. Add a little deionised water if no change observed and shake again.
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