In the qualitative analysis scheme for metal ions, how are the Analytical Group III cations separated...

In the qualitative analysis scheme for metal ions, how are the Analytical Group III cations separated from the cations of Analytical Groups IV and V?

	a.	by addition of H₂S in basic solution, forming insoluble metal sulfides or hydroxides
	b.	by addition of HCl, forming insoluble metal chlorides
	c.	by addition of H₂SO₄, forming insoluble metal sulfates
	d.	by addition of (NH₄)₂CO₃ or (NH₄)₃PO₄, forming insoluble metal carbonates or phosphates
	e.	by addition of H₂S in acidic solution, forming insoluble metal sulfides

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Expert Solution

Answer-

Group III: cations of this group are cobalt(II).

Ammonia solution is added until the solution becomes basic. The trivalent cations from respective insoluble hydroxide and precipitate out.

Then upon addition of Ammonium sulfide , S2- reacts with divalent cations to form respective sulfides which is precipitated.

Ammonium sulfide can be generated in the solution by adding ammonium chloride and passing H2S gas.

Group III: cations of this group are cobalt(II).

Ammonia solution is added until the solution becomes basic. The trivalent cations from respective insoluble hydroxide and precipitate out.

Then upon addition of Ammonium sulfide , S2- reacts with divalent cations to form respective sulfides which is precipitated.

queen_honey_blossom answered 1 year ago

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