what happens when : hydrated copper sulphate is heated. 2 Gypsum is heated at 373 k. 3 Chlorine gas is passed through dry slaked lime
write the chemical equation in each case
Answers
CuSO4.5H2O------> CuSO4 + 5H2O
observation: A white amorpho us powder will be formed from a blue crystalline solid.
2.
2CaSO4.2H2O -----------> 2CaSO4.H2O +3H2O
2CaSO4.H2O is plaster of Paris and is same as CaSO4.1/2 H2O
3.
Ca(OH)2 + Cl2 ———— CaOCl2 + CaCl2 +HCl
CaOCl2 is the bleaching powder. Yellowish green color of chlorine gas fades.
(a) Hydrated CuSO₄ is heated :-
When CuSO₄.5H₂O ( Hydrated copper sulphate) , contains 5 molecules of water of crystallisation.
Salts containing water of crystallisation are called hydrated salts. When the hydrated salt (CuSO₄.5H₂O ) is heated, it loses its water of crystallisation and becomes anhydrous salts (without water of crystallisation).
The blue colour of CuSO₄ is due to the presence of water of crystallisation. Hence, when it loses its water of crystallisation, the solution becomes colourless.
Equation :-
Heat
CuSO₄.5H₂O ------------------------> CuSO₄ + 5H₂O
----------------------------------------------------------------------------------------
(b) Gypsum is heated at 373 K
Gypsum's formula is CaSO₄.2H₂O ( Calcium sulphate dihydrate)
When heated,it leads to the formation of plaster of Paris (CaSO₄.1/2H₂O)
The gypsum loses its water of crystallisation,and forms plaster of Paris.
Plaster of Paris is used to plaster fractured bones, to make toys,etc.
By adding water to plaster of Paris , gypsum can be made.
Equation:-
CaSO₄.2H₂O ------------------------> CaSO₄.1/2H₂O + 3/2H₂O
-------------------------------------------------------------------------------------------
(c)Chlorine gas is passed through dry slaked lime
Slaked lime -> Ca(OH)₂
When Chlorine gas is passed through slaked lime , it leads to the formation of bleaching powder(CaOCl₂ - Calcium oxy chloride) .
Ca(OH)₂ + Cl₂ --------------> CaOCl₂ + H₂O
Read more on Brainly.in - https://brainly.in/question/2128711#readmore