Name of the group 3b reagent
Answers
Answer:
The group reagent is ammonium hydroxide in the presence of ammonium chloride.
Answer:
The group reagent is ammonium hydroxide in the presence of ammonium chloride.
Explanation:
In qualitative analysis, IIIrd group includes Fe3+,Al3+ and Cr3+. The group reagent is ammonium hydroxide in the presence of ammonium chloride. NH4CI is added to suppress the ionisation of NH4OH so that only the IIIrd group radicals are precipitated as their insoluble hydroxide and not the IVth and Vth group radicals as the solubility products of their hydroxides are much higher. Before adding group reagent to the filtrate of IInd group, one drop of concentrated HNO3 (oxidising agent) is added and the content is boiled for 2-3 minutes and then cool because the solubility product of Fe(OH)2 is very high as compared to Fe(OH)3. When a light bluish-green crystalline double salt-containing cations of IIIrd group and zero groups are analysed. it responds to the following tests/reactions.
(a) Its aqueous solution gives a reddish-brown precipitate with an alkaline solution of potassium tetraiodomercurate (II)
(b) Its aqueous solution after boiling with conc. HNO3 gives a reddish-brown precipitate with sodium hydroxide.
(c) The solution of reddish-brown precipitate in oil.HCI gives blood red colouration with ammonium sulphocyanide and Prussian blue with potassium ferrocyanide.
(d) It's a very dilute solution gives a white precipitate with (CH3COO)2Pb solution and a white precipitate are only soluble in hot ammonium acetate.
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