Question

The diagram below shows the set up used by a student to prepare dry sulphur IV oxide gas. Study it carefully and answer the question that follows.

1. Complete the diagram to show how to collect dry sulphur (IV) oxide. 
2. Write an equation for the reaction in the flask. 
3. Give another pair of chemical that could be used to prepare sulphur (IV) oxide. 
4. Sulphur IV oxide gas was bubbled through concentrated nitric (V) acid. State and explain the observations made.

Answer 1

1. 
   
2. Na₂SO_3(s) + 2HCl_(aq) → 2NaCl_(aq) + H₂O(l) + SO_2(g) 
3. Copper ✓1 and Conc. Sulphuric acid 
4. Brown fumes of NO₂ are produced. SO₂ reduces conc. HNO₃ forming brown fumes of NO₂.