test - delete after

Question 1

Flame tests

Answer 1

• Lithium, Li+, Red
• Sodium, Na+, Orange
• Potassium, K+, Lilac
• Calcium, Ca 2+ Brick Red

Question 2

How do Flame tests work?

Answer 2

• Clean platinum wire by dripping in concentrated acid, then into flame
• Dip wire into metal salt
• place in flame

Question 3

How to test of the ammonium ion, NH4+

Answer 3

• Add sodium hydroxide
• Test the gas produced (ammonia, NH3) with DAMP red litmus paper
• paper will turn blue

Question 4

Sodium hydroxide tests

Answer 4

• Cu 2+, Blue precipitate
• Fe 2+, Green precipitate
• Fe 3+, Rust Brown precipitate

Question 5

Halide tests - nitric acid and silver nitrate solution

Answer 5

• Cl (minus) - white
• Br (minus) - cream
• I (minus) - yellow

Question 6

Equation for Cl-

Answer 6

Ag+ (aq) + Cl- (aq) —-> AgCl(s)

Question 7

Equation for Br-

Answer 7

Aq+ (aq) + Br- (aq) —-> AgBr(s)

Question 8

Equation for I-

Answer 8

Aq+ (aq) + I- (aq) —-> AqI(s)

Question 9

Test for sulphate anion (SO4 2-)

Answer 9

• Add hydrochloric acid
• Add a solution of barium chloride
• WHITE precipitate (solid) produced is barium sulphate (BaSo4)

Question 10

Test for the carbonate anion (CO3 2-)

Answer 10

• Add hydrochloric acid
• Bubble the gas (CO2) produced through limewater
• Turns cloudy

Question 11

Chemical test for water, H20

Answer 11

• Anhydrous copper(II) sulphate: White to Blue

- Anhydrous cobalt(II) chloride: Blue to Pink