a. Copy and complete the above table by calculating the percentage of nitrogen in the fertilisers sodium nitrate and potassium nitrate.

(Ar: H = 1; N = 14; O = 16; Na = 23; K = 39; Ca = 40)

b. Including the data you have just calculated, which of the fertilisers contains:

(i) The largest percentage of nitrogen?

(ii) The smallest percentage of nitrogen?

c. Give the chemical name for the fertiliser that goes by the name Nitram®.

d. Ammonia can be used directly as a fertiliser but not very commonly. Think of two reasons why ammonia is not often used directly as a fertiliser.

e. Nitram® fertiliser is manufactured by the reaction of nitric acid with ammonia solution according to the equation:

NH₃(aq) + HNO₃(aq) → NH₄NO₃(aq)

A bag of Nitram® may contain 50 kg of ammonium nitrate. What mass of nitric acid would be required to make it?

Transcribed Image Text:

Fertiliser Formula % nitrogen Ammonia solution 82.4 NH3 Ca(NO,), Calcium nitrate 17.1 Nitram NH,NO; 35.0 Sodium nitrate NANO, Potassium nitrate KNO,