P-Block Elements Ques 520
Question: On adding ammonium hydroxide solution to $ Al_2{{(SO_4)}_3}(aq) $ :
Options:
A) A precipitate is formed which does not dissolve in excess of ammonium hydroxide
B) A precipitate is formed which dissolves in excess of ammonia solution
C) No precipitate is formed
D) None of these
Show Answer
Answer:
Correct Answer: A
Solution:
$ Al_2{{( SO_4 )}_3}+6NH_4OH\xrightarrow{{}} $ $ 2Al{{( OH )}_3}+3{{( NH_4 )}_2}SO_4 $ $ Al{{( OH )}_3}+NaOH\xrightarrow{{}}\underset{Solublecomplex}{\mathop{N{{a}^{+}}{{[ Al{{( OH )}_4} ]}^{-}}}} $ It is insoluble in $ NH_4OH. $
