Precipitates

Question 1

Test for copper (Cu 2+ ions)

Answer 1

Sodium hydroxide (NaOH) - forms copper hydroxide - blue

Question 2

Test for iron (Fe 2+ ions)

Answer 2

Sodium hydroxide (NaOH) - forms Iron (II) hydroxide - green

Question 3

Test for iron (Fe 3+ ions)

Answer 3

Sodium hydroxide (NaOH) - forms Iron (III) hydroxide - brown

Question 4

Test for Lead (Pb 2+ ions)

Answer 4

Potassium iodide (KI) - forms lead iodide - bright yellow

Question 5

Test for Chlorine (Cl - ions)

Answer 5

Silver nitrate (AgNO3) - forms silver chloride - white

Question 6

Test for Bromide (Br - ions)

Answer 6

Silver nitrate (AgNO3) - forms silver bromide - cream

Question 7

Test for Iodide (I - ions)

Answer 7

Silver nitrate (AgNO3) - forms silver iodide - yellow

Question 8

Test for sulphate (SO4 2-)

Answer 8

Barium chloride (BaCl2) - forms barium sulfate - white