Question:
What is Aqua Regia? What happens when aqua regia reacts with (i) Gold, and (ii) Platinum.
What is Aqua Regia? What happens when aqua regia reacts with (i) Gold, and (ii) Platinum.
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The name “Aqua Regia” means “Royal Water” because of its ability to dissolve noble metals like gold and platinum.
Updated On: Oct 7, 2025
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Solution and Explanation
Step 1: Definition of Aqua Regia.
Aqua regia is a freshly prepared mixture of concentrated hydrochloric acid and concentrated nitric acid in the ratio of 3:1. It is a powerful oxidizing and dissolving medium, capable of dissolving noble metals like gold and platinum. Step 2: Reaction with Gold.
Gold dissolves in aqua regia forming chloroauric acid. \[ Au + HNO_3 + 4HCl \longrightarrow H[AuCl_4] + NO + 2H_2O \] Step 3: Reaction with Platinum.
Platinum dissolves in aqua regia forming chloroplatinic acid. \[ Pt + 4HNO_3 + 6HCl \longrightarrow H_2[PtCl_6] + 4NO_2 + 4H_2O \] Conclusion:
Aqua regia is a unique mixture that dissolves even noble metals like gold and platinum, which do not react with single acids.
Aqua regia is a freshly prepared mixture of concentrated hydrochloric acid and concentrated nitric acid in the ratio of 3:1. It is a powerful oxidizing and dissolving medium, capable of dissolving noble metals like gold and platinum. Step 2: Reaction with Gold.
Gold dissolves in aqua regia forming chloroauric acid. \[ Au + HNO_3 + 4HCl \longrightarrow H[AuCl_4] + NO + 2H_2O \] Step 3: Reaction with Platinum.
Platinum dissolves in aqua regia forming chloroplatinic acid. \[ Pt + 4HNO_3 + 6HCl \longrightarrow H_2[PtCl_6] + 4NO_2 + 4H_2O \] Conclusion:
Aqua regia is a unique mixture that dissolves even noble metals like gold and platinum, which do not react with single acids.
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