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CGP EDU Academic Team
Published on: August 12, 2026
What is aqua regia? Write its reaction product with gold and platinum.
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Aqua regia is three parts of concentrated HCl and one part of concentrated HNO 3 .
2Au + 11HCl + 3HNO 3 ⎯→ 2H[AuCl 4 ] + 3NOCl + 6H 2 O
8HCl + 2HNO 3 + Pt ⎯→ H 2 [PtCl 6 ] + 2NOCl + 4H 2 O
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