Feature: Acid Tests
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![PRECIPITATION: SILVER CHLORIDE BY NEUTRALIZATION<br />
(Variations Available)<br />
Formation & Reversal of a Complex Ion<br />
(right) Nitric acid is added to clear solution containing complex ion [Ag(NH3)2]+. (left) As the NH3(aq) is neutralized the formation reaction for the complex ion [Ag(NH3)2]+ is reversed, recombining Ag+ & Cl- to form AgCl(s).](https://m.psecn.photoshelter.com/img-get/I0000h3f6lPvfQE8/t/200/I0000h3f6lPvfQE8.jpg)
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![COMPLEX COPPER IONS IN LIGAND EXCHANGE REACTION<br />
Acidification of Complex Copper II Ions<br />
Nitric acid is added to a deep blue ammonaical solution of [Cu(NH3)4]2+. The solution is converted to the pale blue [Cu(H2O)4]2+. A precipitate of CuOH(s) also forms. Complexes like [Cu(NH3)4]2+ that exchange ligands rapidly are called labile.](https://m.psecn.photoshelter.com/img-get/I0000HXSuVNfvdbg/t/200/I0000HXSuVNfvdbg.jpg)
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