What chemicals erode gold?

Answer 1

=> A 1:3 mixture of concentrated Nitric and Hydrochloric acids(known as Aqua Regia)

Au + HNO3 + 4 HCl ----> HAuCl4 + 2 H2O + NO

=> Similarly, mixture of concentrated Nitric acid and Hydrobromic acid can also dissolve gold

Au + HNO3 + 4 HBr ----> HAuBr4 + 2 H2O + NO

=> Hot and concentrated Selenic acid

2 Au + 6 H2SeO4 ----> Au2(SeO4)3 + 3H2SeO3 + 3 H2O

=> Concentrated, alkaline solutions of Potassium cyanide, in presence of oxygen

4 Au + 8 KCN + O2 + 2 H2O ----> 4K[Au(CN)2] + 4 KOH

=> Dichlorine hexoxide or Chloryl perchlorate

Cl2O6 + Au ----> ClO2+ + Au(ClO4)4-

=> Powdered gold can be treated with excess chlorine or bromine at high temperatures

2 Au + 3 X2 ----> 2 AuX3 (X = Cl, Br)

=> Gold can be treated with oxygen and fluorine at about 370°C and 8 Atmosphere pressures

2 Au + 2 O2 + 6 F2 ----> 2O2AuF6

=> Krypton difluoride can oxidize Gold to its highest oxidation state of +5

7 KrF2 + 2 Au ----> 2 KrF[AuF6] + 5 Kr

Answer 2

Gold is a highly resistant metal and is not easily eroded by most chemical substances. However, it can be affected by a mixture of nitric and hydrochloric acid called aqua regia, which can dissolve gold by oxidizing it into a soluble form. Additionally, some cyanide compounds can also be used to dissolve gold in a process known as cyanidation.