Chemistry
Answer the questions below:
(a) What name is given to the water in the compound copper sulphate-5-water?
(b) If copper sulphate-5-water is heated, anhydrous copper sulphate is formed. What is it's colour?
(c) By what means, other than heating, could you dehydrate copper sulphate-5-water and obtain anhydrous copper sulphate?
(d) Name a deliquescent salt.
(e) Why does hydrated copper sulphate turn white on heating?
Answer
(a) Water of crystallization
(b) White
(c) By adding concentrated sulphuric acid which acts as a dehydrating agent.
(d) Iron [III] chloride FeCl3
(e) The blue coloured hydrous copper sulphate changes to white anhydrous copper sulphate as the water of crystallization is removed on heating.
CuSO4.5H2O ⟶ CuSO4 + 5H2O
Related Questions
What do you understand by the water of crystallisation?
Give four substances which contain water of crystallisation and write their common names.
(a) Define efflorescence. Give examples.
(b) Define deliquescence. Give examples.
State your observation when the following are exposed to the atmosphere:
(a) Washing soda crystals
(b) Iron (III) chloride salts.
Give reasons for the following:
(a) Sodium hydrogen sulphate is not an acid, but it dissolves in water to give hydrogen ions according to the equation
NaHSO4 ⇌ H+ + Na+ + SO42-
(b) Anhydrous calcium chloride is used in a desiccator.