4) Qualitative analysis

Question 1

What are the reagents and observations when testing for CO3 2-

Answer 1

Reagents = any acid
Observations = bubbles

Question 2

How do you test for CO2

Answer 2

-Bubble it through limewater
- Forms a white precipitate

Question 3

What are the reagents and observations when testing SO4 2-

Answer 3

Reagents = Soluble barium compound
Observations = White precipitate formed

Question 4

What are the reagents and observations when testing for halides

Answer 4

Reagent = Silver nitrate solution
Observations = Cl- White precipitate
Br- Cream precipitate
I- Yellow precipitate

Question 5

What are the halides solubility in NH3 solution

Answer 5

Cl- soluble in dilute NH3
Br- soluble in concentrated NH3
I - insoluble in concentration NH3

Question 6

What is the sequence of tests you should do

Answer 6

1) Carbonate test
2) Sulfate test
3) Halide test

Question 7

What are the reagents and observations when testing for ammonium

Answer 7

Reagents = Sodium hydroxide solution
Observation = Damp red litmus paper turns blue

Question 8

What is the reagent when testing for transition metals

Answer 8

sodium hydroxide solution

Question 9

What colour precipitate does copper 2 turn into

Answer 9

Blue to light blue

Question 10

What colour precipitate does Iron 2 turn into

Answer 10

Pale green to orange/ brown

Question 11

What colour precipitate does Iron 3 turn into

Answer 11

Pale yellow to rusty brown

Question 12

What colour precipitate does Mn 2 turn into

Answer 12

Very pale pink to Pale brown

Question 13

What colour precipitate does Mn 3 turn into

Answer 13

Green to Grey/ Green