Question

Hydrogen gas was prepared in the lab. Using the following set up

1. Write an equation for the reaction taking place and balance it
2. Name the method used to collect the gas and give a property of hydrogen that enables it to be collected through the method.
3. Name liquid R and state its function in the set up
4. Explain why it is not advisable to use sodium metal in place of zinc metal 
5. What will happen to the pH of the solution in the beaker after one day? Give an explanation.

Answer 1

1. Upward delivery/downward displacement of air
2. It is less denser than air 
3.    
   • Liquid R: - Conc. Sulphuric (VI) acid (1mk)
   • Function: - For drying hydrogen (1mk)
4. Reaction would be explosive/dangerous because sodium is very reactive
5.    
   • It goes down.
   • The solution becomes more acidic.