why the amount of HCl is more in aqua regia as compared to HNO3 ? Identify the charges present on chlorine atom in the reaction
Answers
Explanation:
Aqua regia is a mixture of nitric acid and hydrochloric acid, optimally in a molar ratio of 1:3. Aqua regia is a yellow-orange (sometimes red) fuming liquid, so named by alchemists because it can dissolve the noble metals gold and platinum, though not all metals.
OR
Gold and platinum dissolve in aqua regia (a mixture of conc. hydrochloric acid and conc. nitric acid in 3:1 ratio). The conc. nitric acid results in the liberation of nascent chlorine by oxidizing conc. hydrochloric acid. This nascent chlorine reacts with gold and platinum to give their respective chlorides. These chlorides are soluble. Gold and platinum can then be recovered from these chlorides when required.
HNO
3+3HCI-NOCI+2H
2 O+2[CI]
Au+3[CI]+AuCl
3Pt+4[CI]+PtCl 4
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