RP4: Test for ions Flashcards
1
Q
How do you test for group 2 ions?
A
Flame test
- Ca2+ brick red
- Sr2+ red
- Ba2+ pale green
2
Q
How do you test for ammonium compounds?
A
Add NaOH and gently heat, ammonia gas is produced which turns damp red litmus paper blue
3
Q
How do you test for hydroxide compounds?
A
Since they are alkaline they turn damp red litmus paper blue
4
Q
How do you test for carbonate compounds?
A
Add HCl which should produce CO2 gas, bubbled through limewater = cloudy
5
Q
How do you test for sulfate compounds?
A
Add HCl to remove any carbonates, add BaCl2, ppt of barium sulfate should form
