State as to why a solution of Na2CO3 is alkaline.
What happens when:
(i) sodium carbonate reacts with the milk of lime.
(ii) sodium carbonate is added to water.
(iii) sodium carbonate reacts with a dilute mineral acid?
How is sodium hydroxide manufactured? Discuss in brief the details of the process.
Or
With the help of a diagram, show the reactions at the cathode and anode in the manufacture of sodium hydroxide by the Castner - Kellner process.
Explain what happens when:
(i) Sodium hydrogen carbonate is heated
(ii) Sodium amalgam reacts with water
(iii) Fused sodium metal reacts with ammonia?
Explain the significance of sodium, potassium, calcium and magnesium in biological fluids ?