LC CHEMISTRY- EXPERIMENT: Flame test and Test for Anions

Test for carbonate ion

Reacts with dilute HCl to produce CO₂ gas.

When carbonate is added to MgSO₄ solution it produces a white precipitate

Test for chloride ion

Reacts with AgNO₃ solution to produce a white precipitate.

The precipitate dissolves when dilute NH₃ is added

Test for hydrogencarbonate ion

Reacts with dilute HCl to produce CO₂ gas.

When hydrogencarbonate is added to MgSO₄ solution, it produces a clear solution which turns white when heated

Test for nitrate ion

Add cold FeSO₄ solution, and a little concentrated H₂SO₄ slowly.

A brown ring forms between the two layers

Test for phosphate ion

Add ammonium molybdate reagent and a few drops of concentrated HNO₃, and warm to 40ºC to produce a yellow precipitate.

When NH₃ solution is added, the precipitate dissolves

Test for sulfate ion

Reacts with BaCl₂ to produce a white precipitate.

When dilute HCl is added to the precipitate, it does NOT dissolve

Test for sulfite ion

Reacts with BaCl₂ to produce a white precipitate.

When dilute HCl is added to the precipitate, it dissolves

dip damp wooden splint into sample of salt

place into blue bunsen flame

record the colour of the flame

method for flame test

crimson

lithium

lilac

potassium

barium

green

red

strontium

blue green

copper

yellow e.g street lights

sodium