Test for Carbon Dioxide Flashcards
All 6 cards in this deck
What is the test for carbon dioxide gas?
Bubble the gas through (or shake it with) limewater.
Limewater is an aqueous solution of which compound?
Calcium hydroxide.
What is the positive result of the limewater test for carbon dioxide?
The limewater turns milky (cloudy).
True or false? Limewater turns milky because a white precipitate of calcium carbonate forms.
True. Carbon dioxide reacts with the calcium hydroxide to make insoluble calcium carbonate.
Which gas test would you use on the gas given off when a carbonate reacts with a dilute acid, and what would you see?
Bubble it through limewater; the limewater turns milky, showing carbon dioxide.
What are the steps to test a gas for carbon dioxide?
e.g. the gas given off when calcium carbonate reacts with dilute hydrochloric acid
- Collect the gas in a test tube.
- Bubble the gas through limewater (aqueous calcium hydroxide).
- Limewater turning milky (cloudy) shows the gas is carbon dioxide.