What happens when ethanoic acid reacts with sodium carbonate? Write chemical equation of the reaction involved.

35 Why is soap not suitable for washing clothes when the water is hard? 36 What happens when methane (natural gas) bums in air? Write the chemical equation of the reaction involved. 36 Give a test that can be used to differentiate chemically between butter and cooking oil. 37 Describe, giving equation, a chemical reaction which is characteristic of saturated hydrocarbons (or alkanes).