NH₄NO₃

NH₄Cl

(NH₄)₂SO₄

NH₄NO₃ and (NH₄)₂SO₄

Because HCl is highly reactive.

Because HCl is volatile.

Because HCl does not react with nitre/chile saltpetre.

Because HCl adds impurities in the solution.

Boiling point: - 83�C and melting point: -113�C

Boiling point: 93�C and melting point: 86�C

Boiling point: 82�C and melting point: - 30�C

Boiling point 113�C and melting point - 90�C

It destroys the nucleus of the blood cells.

It destroys the haemoglobin in the blood.

It destroys the plasma membrane of the blood cells.

It reacts with haemoglobin and forms sulphoxy haemoglobin.

It reacts with barium chloride and forms white precipitates.

It releases SO₂ on heating with copper.

It forms H₂ gas on heating with NaCl.

It is used in the extraction of metals.

D₂O

H₂O along with Ca and Mg carbonates

H₂O₂

Sea water (H₂O + Salt)

Scheele

Lavoiser

Daniel Rutherford

Cavendish

potassium permanganate

air

water

sodium peroxide

bubbling air through molten sulphur

allowing molten sulphur to crystallise slowly in contact with hot molten sulphur

passing an electric arc through sulphur vapour

cooling molten sulphur quickly with water

0°C

• 4°C

• 78°C

4°C