SS2 Second Term Chemistry Lesson Note – Compounds of Nitrogen

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WEEK 8    

TOPIC: COMPOUNDS OF NITROGEN

1. Nitrogen: compounds of nitrogen: Trioxonitrate(v) acid
2. Laboratory preparation and physical properties
3. Chemical properties of Trioxonitrate (v) acid
4. Uses of Trioxonitrate (v) acid
5. Trioxonitrate(v) salts- action of heat, test for Trioxonitrate (v) ions.

PERIOD 1: NITROGEN: COMPOUNDS OF NITROGEN: TRIOXONITRATE(V) ACID –   LABORATORY PREPARATION AND PHYSICAL PROPERTIES      

Trioxonitrate (v) acid is prepared by heating solid sodium trioxonitrate (v) with concentrated tetraoxosulphate (vi) acid.

NaNO₃ + H₂SO₄ → HNO₃ + NaHSO₄

The apparatus used is completely made of glass because rubber and cork are attack by trioxonitrate (v) acid. The trioxonitrate (v) acid produced in this case is yellow in colour due to the slight decomposition of the acid by heat to produce reddish-brown gas (nitrogen (iv))   which then dissolve in the acid to impart the yellow colour.

4HNO₃ →  H₂O + 4NO₂ + O₂

PHYSICAL PROPERTIES OF TRIOXONITRATE (V) ACID

1. It is corrosive and readily destroys organic materials.
2. It turns blue litmus paper red.
3. It is a colourless liquid which fumes in air on exposure.

EVALUATION:

1. Explain why trioxonitrate (v) acid produced in the laboratory is yellow in colour.

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