In one place in the procedure for the analysis of Aluminum Group cations, alumin

Question

In one place in the procedure for the analysis of Aluminum Group cations, aluminum was dissolved by adding NaOH to form the AI(OH)4 ion, whereas in another place, AI(OH)t was dissolved by adding acid. What property of aqueous aluminum solutions is being made use of here? State your reasoning. Before the carbonates of barium and calcium are precipitated, the solution is buffered at basic pH. How was the mixture buffered, and why was this necessary? A solution that has a pH of 3 is known to contain calcium chloride Ammonium oxiate is added, and no precipate forms. Anmonia is then added until the solution tests bask to pH paper and a precipiate is obsrved to form. Explain these observations, include equation. Explain why an excess of Fe2+ is necessary for the NO3-test, include equations. A yellow solid that is known to be a single salt is completely insoluble in hot water, but dissolves in hot dilute HCI to give a yellow-brown solution. When this solution is cooled, a white crystalline precipitate forms. This precipitate redissolves when the solution is heated, but does not redissolve when cold water is added. What is the salt? State your reasoning.

Explanation / Answer

18

Al(OH)3 can react with acid as well as base. This property is known as amphoteric. The above example shows its amphoteric nature.

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