1- Why does the initially formed copper hydroxide precipitate dissolve.docx

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1. Why does the initially formed copper hydroxide precipitate dissolve upon addition of aqueous ammonia while synthesizing copper(II) acetate monohydrate? 2. Melting points and boiling points of compounds usually increase with increasing molecular weight, but the hexamethylcyclotrisiloxane is a solid at room temp and octamethylcyclotetrasiloxane is a liquid. Why might cyclotrimer be an exception to the normal rule Solution 1. When concentrated ammonia solution is slowly added in a light blue, aqueous solution of copper( II) chloride, there is formation of, light blue precipitate of copper(II) hydroxide. Further excess addition of ammonia causes the Cu +2 ions to go back into solution and hence continued addition of ammonia results the formation of a soluble deep blue complex copper ammonia ion means initially formed copper hydroxide precipitate dissolve upon addition of aqueous ammonia at this stage. 2. Tghis is due to the difference in arrangement oof molecules in a compound means the crystal lattic. The crystal lattice of has highly cross-links structure. .

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