question_answer

Write one point of difference between each of the following:

(i) A hydrated salt and an anhydrous salt

(ii) Washing soda and soda ash

(ii) Baking soda and Baking powder

Answer:

(i) Hydrated salt is a salt with water as water of crystallisation whereas Anhydrous slat is the slat which gives away its water of crystallisation.

(ii) Washing soda is sodium carbonate having ten molecules of water crystallization \[(N{{a}_{2}}C{{O}_{3}}.10{{H}_{2}}O)\] whereas soda ash is sodium carbonate decahydrate \[(N{{a}_{2}}C{{O}_{3}}.\,10{{H}_{2}}O)\] when loses its 9 units of crystallisation is called soda ash\[(N{{a}_{2}}C{{O}_{3}}{{H}_{2}}O)\].

(iii) Baking soda is sodium bicarbonate \[(NaHC{{O}_{3}})\] whereas baking powder is a mixture of banking soda \[(NaHC{{O}_{3}})\] and tartaric acid \[({{C}_{4}}{{H}_{6}}{{O}_{6}})\].