Chemitry Metal Ions

Question 1

Ammonia formula

Answer 1

NH3

Question 2

Ammonium formula

Answer 2

NH4

Question 3

Where is ammonium found

Answer 3

Salts such as ammonium chloride

Question 4

What is the test for ammonium

Answer 4

Place 1cm3 of NH4CL in tests tube
Add 1cm3 of NaOH(sodium hydroxide solution)
Warm gently
Hold down red litmus paper at tube mouth
Litmus paper turns blue(result0

Question 5

What is the test for Metal ions

Answer 5

Add 1cm3 of metal salt solution to test tube
Add 5 drops of NaOH and shake gently
Result
Copper forms blue precipitate
Iron 3+ forms orange-brown precipitate
Iron 2+ forms green precipitate

Question 6

Flame test for metal ions

Answer 6

Dip platinum wire in concentrated hydraulic acid (cleans the wire)
Hold wire in non luminous flame
Dip wire in metal salt and hold in the flame

Question 7

Flame test for metal ions results

Answer 7

Lithium(li+)red
Sodium(Na+)yellow
Potassium(K+)lilac
Calcium(ca2+)orange red
Copper(Cu2+)

Question 8

What is Hcl

Answer 8

Hydraulic acid

Question 9

What is H2SO4

Answer 9

Sulphuric acid

Question 10

What is HNO3

Answer 10

Nitric acid

Question 11

Method for halide ions

Answer 11

Take 1cm3 of the halide solution to the test tube
Add 5 drops of nitric acid(HNO3)-(reacts with carbonate ions so there is no false positives)
Add 1cm3 of silver nitrate(AgNo3)

Question 12

Explain why the reaction of yellow lead oxide with hydrogen is a redox reaction

Answer 12

Lead starts with oxygen but loses the oxygen. This is a redox reaction.hydrogen starts with no oxygen but gains oxygen. This is oxidation

Question 13

How do u test for surface ion

Answer 13

Add 1cm3 barium chloride solution to a test tube
Add 5 drops of hydraulic acid(removes carbonate ions which would give a false positive white precipitate)
Add 1cm3 of potassium sulfate

Question 14

Halide ion colours chloride

Answer 14

White precipitate

Question 15

Bromine

Answer 15

Cream precipitate

Question 16

Iodine

Answer 16

Yellow precipitate