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POTASSIUM

Potassium is a soft silvery reactive element belonging to the group I of the periodic table. It is characterised by

 
Atomic number 19
 
Relative atomic mass 39.098
 
Relative density 0.87
 
Melting point 63.7OC
 
Boiling point 774OC

OCCURRENCE

Potassium basically occurs in minerals, as sylvine (KCl), Carnalite (KCl.MgCl2.6H2O) and salt petre (KNO3)

EXTRACTION
Potassium is usually prepared by the action of heat […]

DETERMINATION OF MOLECULAR WEIGHT

CALCULATION OF MOLECULAR WEIGHT FROM LOWERING OF VAPOUR PRESSURE 
It is a property of liquids to vapourise (give off their vapours) at one or the other temperature. Thus, if we keep a liquid in a closed vessel, it shall vapourise. Depending upon the […]