Anion and Cation Test

Question 1

Al 3+

Answer 1

1. Add NaOH or NH3
2. White precipitate forms in both solutions
3. Only soluble in excess NaOH

Question 2

Cu 2+

Answer 2

1. Add NaOH or NH3
2. Blue Precipitate Forms
3. Nothing happens in NaOH, but a dark blue precipitate forms in NH3.

Question 3

Ca 2+

Answer 3

1. Add NaOH or NH3
2. White precipitate forms in NaOH but is transparent in NH3.
3. Insoluble in Excess

Question 4

Fe 2+

Answer 4

1. Add NaOH or NH3
2. Green Precipitate Forms
3. Insoluble in Excess

Question 5

Fe 3+

Answer 5

1. Add NaOH or NH3
2. Brown Precipitate Forms
3. Insoluble in Excess

Question 6

Zn 2+

Answer 6

1. Add NaOH or NH3
2. White Precipitate forms
3. Soluble in Excess

Question 7

NH4

Answer 7

1. Add NaOH and heat gently
2. Litmus paper turns blue due to ammonia gas produced

Question 8

Cl -

Answer 8

1. Add nitric acid and silver nitrate
2. Silver Chloride turns precipitate white

Question 9

NO3 -

Answer 9

1. Add NaOH, and aluminum foil, and heat strongly
2. Ammonia gas is produced -> litmus paper blue

Question 10

SO4 2-

Answer 10

1. Add nitric acid and then barium chloride
2. White barium sulfate forms

Question 11

I -

Answer 11

1. Add nitric acid and silver nitrate
2. Yellow silver iodide forms

Question 12

CO3 2-

Answer 12

1. Add dilute NaOH
2. Bubble gas in limewater, turning it cloudy

Question 13

Br -

Answer 13

1. Add nitric acid and silver nitrate
2. Creamy precipitate formed