Aqua Regia Dissolving Gold
Au + 3HCl + HNO3 → HAuCl4 + NO + 2H2O
ภาพรวม
Aqua regia (3:1 mixture of HCl and HNO₃) dissolves gold, which is inert to either acid alone. Nitric acid oxidizes gold to Au³⁺ while hydrochloric acid provides chloride ions that stabilize the gold as [AuCl₄]⁻ complex. The synergy between the two acids makes aqua regia effective against noble metals.
ผู้เข้าร่วม
| บทบาท | สาร | สัมประสิทธิ์ | สถานะ |
|---|---|---|---|
| สารตั้งต้น | Gold Au | 1 | (s) |
| สารตั้งต้น | Nitric Acid HNO₃ | 1 | (aq) |
| สารตั้งต้น | Hydrochloric Acid HCl | 3 | (aq) |
| ผลิตภัณฑ์ | Water H₂O | 2 | (l) |
ตัวอย่างในชีวิตประจำวัน
During WWII, George de Hevesy dissolved the Nobel Prize gold medals of Max von Laue and James Franck in aqua regia to hide them from the Nazis.
ความสำคัญทางอุตสาหกรรม
Aqua regia is used in gold refining, analytical chemistry for dissolving noble metals, and in recovering precious metals from electronic waste.
คุณสมบัติ
- ประเภท
- Redox
- ย้อนกลับได้
- ไม่
- พลังงาน
- คายความร้อน
- ΔH
- -150.0 kJ/mol
ปฏิกิริยาที่เกี่ยวข้อง
Iron(II) to Iron(III) Oxidation by Oxygen
Bleaching with Sodium Hypochlorite
Copper Reduction of Silver Ion
Cerium(IV) Reduction by Iron(II)
Copper Oxidation by Nitric Acid
Hypochlorite Oxidation of Hydrogen Peroxide
Hydrogen Peroxide as Oxidizing Agent (Acidic)
Hydrogen Peroxide Disproportionation
Iodine and Sodium Thiosulfate Titration
Displacement of Hydrogen from Acid by Magnesium
Frequently Asked Questions
What is the equation for Aqua Regia Dissolving Gold?
The balanced equation is: Au + 3HCl + HNO₃ → HAuCl₄ + NO + 2H₂O.
What type of reaction is Aqua Regia Dissolving Gold?
Aqua Regia Dissolving Gold is a redox reaction.
Is Aqua Regia Dissolving Gold exothermic or endothermic?
Aqua Regia Dissolving Gold is exothermic (releases energy). The enthalpy change (ΔH) is -150.0 kJ/mol.