Test For NH4+

Question 1

True or false is Ammonia NH3 a base

Answer 1

Is a base by definition and it accepts protons H+

Question 2

What is the formula for the test for NH4+

Answer 2

NH3 + HCl → NH4+ + Cl-

Note this is a reversible reaction

Question 3

State the test for NH4+

Answer 3

1) Add NaOH (sodium hydroxide) this turns NH4+ to NH3
2) Warm this up to turn NH3 liquid to gas
3) Observation damp red litmus paper turn blue

Question 4

Metal ions react with hydroxide ion to form

Answer 4

Metal hydroxide
M+ + OH- ➡️ MOH

Question 5

Name precipitation of metal ions when they react with hydroxide
Calcium
Magnesium
Aluminum
Copper (II)
Iron (II)
Iron (III)

Answer 5

-Calcium white precipitation
-Magnesium white precipitation
-Aluminum white precipitation
-Copper (II) light blue precipitation -Iron (II) green : gradually turns brown if it comes in contact with air precipitation
-Iron (III) rusty brown precipitation