Test for carbonate ions Flashcards
1
Q
What does this test for?
A
Carbonate ions CO₃²⁻
And
Hydrogen carbonate ions
HCO₃⁻
2
Q
Step 1
A
Mix solution with dilute HCl
3
Q
What happens when mixed with dilute HCl?
A
The anions react with H+ to form H2O and CO2
4
Q
What observation is made when adding HCl?
A
Fizzing to show that a gas has been made
(Unsure of what this gas is so move onto step 2)
5
Q
Step 2
A
Identify the gas is carbon dioxide using Limewater
Bubble gas through test tube w limewater using delivery tube
6
Q
What is limewater?
A
Calcium hydroxide
7
Q
Positive result that the gas collected is CO2 thus carbonate/hydrogencarbonate anion is present
A
Limewater turns cloudy
