solubility of the salts of s block salts in water

• Variation of solubility of sulphates and hydroxides down the group can be explained by using lattice enthalpy and hydration enthalpy values.

• Variation of thermal stability of s block carbonates, bicarbonates and nitrates down a group can be explained by using electronegativity values of elements and ionic nature of those compounds.

Acidic/basic/amphoteric nature of halides (eg. chlorides) of third period

NaCl – Neutral  

MgCl₂ – very weakly acidic                     

AlCl₃  – acidic                

SiCl₄ – acidic                

PCl₅ – acidic                       

SCl₂ /S₂Cl₂ –  acidic

Acidic/basic/amphoteric nature of oxides of elements of the 3rd period

Na₂O  strongly basic          

MgO  basic          

Al₂O₃  amphoteric                     

SiO₂  very weakly acidic               

P₂O₅  weakly acidic                

SO₂ /SO₃  acidic                    

Cl₂O₇  strongly acidic

Nature of oxides down the group 15

Ν₂Ο₃ − acidic

P₂Ο₃ − weakly acidic

As₂Ο₃ − amphoteric

Sb₂Ο₃ − amphoteric

Bi₂Ο₃ − basic

Acidic/basic/amphoteric nature of hydroxides of elements of the 3rd period

NaOH  strongly basic          

Mg(OH)₂  basic            

Al(OH)₃  amphoteric           

Si(OH)₄  →^-H₂O  H₂SiO₃   very weakly acidic        

P(OH)₅   →^-H₂O  H₃PO₄  weakly acidic         

S(OH)₆   →^-2H₂O  H₂SO₄  acidic    

Cl(OH)₇  →^-3H₂O   HClO₄  strongly acidic                                                                                  

Acidic/basic/amphoteric nature of hydrides of the 3rd period

NaH  strongly basic                

MgH₂  weakly basic                 

AlH₃  amphoteric                 

SiH₄  very weakly acidic                  

PH₃  very weakly basic                    

H₂S  weakly acidic                 

HCl  very strongly acidic