Chemistry
How are the metals like sodium, potassium and calcium obtained. Give equations.
Metallurgy
42 Likes
Answer
Oxides of highly active metals like sodium, potassium and calcium are obtained by electrolytic reduction of fused metallic salts (halides and oxides) using inert electrodes.
Sodium
Electrolyte : Fused sodium chloride
Reaction : NaCl ⇌ Na+ + Cl-
Reaction at cathode : Na+ + e- ⟶ Na
Reaction at anode : Cl- - e- ⟶ Cl
Cl + Cl ⟶ Cl2
Potassium
Electrolyte : Fused potassium bromide
Reaction : KBr ⇌ K+ + Br-
Reaction at cathode : K+ + e- ⟶ K
Reaction at anode : Br- - e- ⟶ Br
Br + Br ⟶ Br2
Calcium
Electrolyte : Fused calcium chloride
Reaction : CaCl2 ⇌ Ca2+ + 2Cl-
Reaction at cathode : Ca2+ + 2e- ⟶ Ca
Reaction at anode : Cl- - e- ⟶ Cl
Cl + Cl ⟶ Cl2
Answered By
28 Likes
Related Questions
An ore on being heated in air forms sulphurous anhydride. Write the process used for the concentration of this ore.
(a) Define roasting. Name an ore on which roasting is done. Give balanced equation.
(b) Define calcination. Give an example and equation for calcination.
Give equations for the reduction of :
(a) Iron (II) oxide
(b) Iron (III) oxide
(c) Lead (II) oxide
(d) Zinc oxide
(a) On which factors does purification of metals depend?
(b) Name the methods used for purification.
(c) With a labelled diagram explain electro-refining of a particular metal.