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and Basic Character of Hydroxides of Third Row Elements
The hydroxy compounds of Na, Mg,
Al are called hydroxides and those of Si, P, S
and Cl are called oxy acids (acids containing
M-O-H MO- + H+
M-O-H will act as base if it produces OH- ions in
Thus, hydroxides of these elements are strong bases.
Si and P have
I.P. values lower than S and Cl. Thus, the hydroxides
of these elements are weak acids.
The hydroxide of Al shows both acidic and basic character.
Al(OH)3 + 3HCl ® AlCl3 + 3H2O
Al(OH)3 + NaOH ® NaAlO2
Thus, in the third row elements, the basic character of the hydroxide
decreases and the acidic character of the hydroxy
compounds increases with increase in I.P. value.