Potassium is lighter than sodium (Refer table 5.3)
The correct order of density is Li < K < Na
< Rb < Cs
Li+ has maximum degree of hydration
among alkali metal cations.
Li+ > Na+ > K+
> Rb+ > Cs+
Potassium carbonate cannot be prepared by solvay
process. Potassium bicarbonate is fairly soluble in water and does not
precipitate out.
ionic character (difference in electronegativity)
MI < MBr < MCl < MF
Castner's process
NaOH ↔ Na+ + OH–
Cathode : Na+ + e– → Na
Anode : 2OH– → H2O + 1/2O2
+ 2e–