p-Block elementsHardBloom L3

Question

Al2(SO4)3 + NH4OH → X, then

Options

A.X is a white-coloured compound
B.X is insoluble in excess of NH4OH
C.X is soluble in NaOH
D.X cannot be used as an antacid

Solution

Sol. Al2​(SO4​)3 ​+ 6NH4​OH → 2Al(OH)3 ​+ 3 (NH4​)2​SO4​

X is Al(OH)3​ which is white gelatinous precipitate soluble in strong alkalis like NaOH and insoluble in excess of NH4​OH.

Al(OH)3​+NaOH→Na[Al(OH)4​]

Antacid is a drug (or medicine) preventing or correcting acidity, especially in the stomach.

To neutralize the acid in stomach, antacid should be basic in nature.

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