First slide

Atomic and physical properties

Question

The dissociation of $Al {(OH)}_{3}$ by a solution of NaOH results in the formation of

Moderate

A

${[Al {(H_{2} O)}_{2} {(OH)}_{4}]}^{-}$
B

${[Al {(H_{2} O)}_{4} (OH)]}^{2 +}$
C

$[Al {(H_{2} O)}_{3} {(OH)}_{3}]$
D

$[Al {(H_{2} O)}_{6} {(OH)}_{3}]$

Solution

$Al {(OH)}_{3} + {OH}^{-} \overset{}{\to} [Al {(OH)}_{4}^{-}]$
Coordination number is 6; thus, it exists as
${[Al {(H_{2} O)}_{2} {(OH)}_{4}]}^{-}$

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