Analytical ChemistryHard

Question

Which one of the following can be used in place of NH4Cl for the identification of the third group radicals?

Options

A.NH4NO3
B.(NH4)2SO4
C.(NH4)2CO3
D.NaCl.

Solution

As it provides NH4+ ions which suppresses the ionisation of NH4OH so that only the group 3rd cations are precipitated as hydroxides because of their low solubility products and NO3- ions do not produce precipitate with the cations of IVth, Vth and VIth groups.

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