Why is the white ppt. ,Al(OH)3 not soluble in (NH)4OH?
i mean ammoium ion should displace silver from its salt right??

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Solution

(NH4)OH or liquid ammonia is a weak base it can not give enough amount of oh- ions to dissolve al(oh)3. The al(oh)3 is soluble only when the medium has good concentration of oh- ions. Thus al (oh)3 does not dissolve in aq. medium of NH4(OH).

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