Aqueous ammonia is used as a precipitating reagent for Al 3 + ions as Al(OH) 3 rather than aqueous NaOH, because

Question

Aqueous ammonia is used as a precipitating reagent for Al 3 + ions as Al(OH) 3 rather than aqueous NaOH, because, NH 4 + is a weak base, NaOH is a very strong base, NaOH forms [Al(OH) 4 ] − ions, NaOH forms [Al(OH) 2 ] + ions.

MARKS App · Accepted Answer

Al(OH) 3 formed with NaOH dissolves in excess of NaOH to form aluminate ion. which is stable. AlCl 3 + 3 NaOH ⟶ 2 Al OH 3 ↓ + 3 NaCl Al OH 3 + OH − → Al OH 4 − Soluble

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