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

Chemistry - Complete Pblock- Question with Solution | TestHub

ChemistryComplete Pblock-p-Block 13,14Easy2 minPYQ_2020

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Aqueous ammonia is used as a precipitating reagent for Al³⁺ions as Al(OH)₃rather than aqueous NaOH, because

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Answer:

Solution:

Al(OH)₃formed with NaOH dissolves in excess of NaOH to form aluminate ion.
which is stable.

${AlCl}_{3} + 3 NaOH ⟶ 2 Al {(OH)}_{3} ↓ + 3 NaCl$

$\begin{array}{l} Al {(OH)}_{3} + {OH}^{-} \to {[Al {(OH)}_{4}]}^{-} \\ Soluble \end{array}$

Stream:NTA_ABHYAS_NEETSubject:ChemistryTopic:Complete Pblock-Subtopic:p-Block 13,14

⏱ 2mℹ️ Source: PYQ_2020

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