test for ions Flashcards
1
Q
How do we test for Br2?
A
- Add silver nitrate
- Add NH3
2
Q
Positive test for Bromine
A
- Cream precipitate
- soluble in concentrated ammonia
3
Q
How do we test CL2?
A
- Add silver nitrate
- Add NH3
4
Q
Positive test for Cl2
A
- White precipitate
- Dissolves in dilute NH3
5
Q
How do we test for I2?
A
- Add silver nitrate
- Add NH3
6
Q
Positive test for I2?
A
- Yellow
- insoluble in both diluted and concetrated ammonia
7
Q
How to test for Carbonates?
A
- Add Acid (HCL)
- Limewater
8
Q
Positive test for carbonates
A
- HCl causes CO2 to bubble
- This bubbles through limewater and turns cloudy
9
Q
What is the ionic test for carbonates?
A
Co3(2-) + 2H+ - CO2 + H2O
10
Q
How to test for sulfates?
A
- Add HCL
- Add barium chloride
11
Q
Why is HCL added?
A
to remove carbonates and prevents a false result
12
Q
What is a positive result for sulfates?
A
White precipiate - barium sulfate
13
Q
What is the test for ammonia?
A
- Add NAOH
- ammonia gas will produce
- use damp red limitus paper = turns blue if present
