The equilibrium `Al(OH)_3+OH^(-)hArr [Al(OH)_4]^(-)` in aqueous medium shifts towards the left in the presence of :
The equilibrium
`Al(OH)_3+OH^(-)hArr [Al(OH)_4]^(-)`
in aqueous medium shifts towards the left in the presence of :
A. `NH_4Cl`
B. Dilute `H_2SO_4` (not in excess)
C. NaOH
D. carbon dioxide gas
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Correct Answer - A,B,D
The reagent which will reduce the hydroxyl-ion concentration sufficiently cause the reaction to proceed from right to left with the consequent precipitation of `Al(OH)_3`.
`[Al(OH)_4]^(-)+NH_4^(+)toAl(OH)_3darr+NH_3+H_2O`
`[Al(OH)_4]^(-)+H^(+)toAl(OH)_3darr +H_2O`
`2Na[Al(OH)_4]+CO_2toAl_2O_3. XH_2O(s)+2NaHCO_3`
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