Question

Figure 10.2 shows the apparatus used for the preparation of nitric acid by Ostwald's process. [5 MARKS]

(a) What two mistakes do you notice in the arrangement?
(b) Name the reactants.
(c) In what proportion are the reactants taken in this process?
(d) What is the function of platinum gauze in this process?
(e) What is the function of quartz packing in the absorption tower?

Answer 1

Each Part: 1 Mark

(a) In the arrangement where nitric acid is labelled, it should be water, and where water is labelled it should be nitric acid.
(b) Ammonia and air are the two reactants.
(c) Ammonia and air are taken in the ratio of 1 : 10.
(d) Platinum gauze acts as a catalyst.
(e) Quartz packing in the absorption tower:
(i) slows down the upward displacement of nitrogen dioxide and other gases, and also slows down the downward displacement of water.
(ii) provides greater surface area in which nitrogen dioxide comes in contact with water.