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sergejj [24]
1 year ago
13

Aqua regia, a mixture of concentrated HNO₃ and HCl, was developed by alchemists as a means to "dissolve" gold. The process is a

redox reaction with this simplified skeleton reaction:\mathrm{Au}(s)+\mathrm{NO}_{3}^{-}(a q)+\mathrm{Cl}^{-}(a q) \longrightarrow \mathrm{AuCl}_{4}^{-}(a q)+\mathrm{NO}_{2}(g) (a) Balance the reaction by the half-reaction method.
Chemistry
1 answer:
Verizon [17]1 year ago
4 0

a) Balanced equation;

Au +3 NO^{-}  _{3} +4Cl^{- }+6H^{+} ⇒ AuCl^{-}_{4}  + 3NO_{2} + 3H_{2} O

b) oxidizing agent: N

    reducing agent: Au

a) The unbalanced redox equation is as follows:

Au + NO^{-}  _{3} +Cl^{- }+H^{+} ⇒ AuCl^{-}_{4}  + NO_{2} + H_{2} O

Balance all atoms other than H and O.

Au + NO^{-}  _{3} +4Cl^{- }+H^{+} ⇒ AuCl^{-}_{4}  + NO_{2} + H_{2} O

The oxidation number of gold changes from 0 to +3. The change in the oxidation number of gold is 3.The oxidation number of nitrogen changes from +5 to +4. The change in the oxidation number of nitrogen is 1.

So,

Au +3 NO^{-}  _{3} +4Cl^{- }+H^{+} ⇒ AuCl^{-}_{4}  + 3NO_{2} + H_{2} O

Now balance O atoms on RHS,

Au +3 NO^{-}  _{3} +4Cl^{- }+H^{+} ⇒ AuCl^{-}_{4}  + 3NO_{2} + 3H_{2} O

Now, balance hydrogen atoms on RHS,

Au +3 NO^{-}  _{3} +4Cl^{- }+6H^{+} ⇒ AuCl^{-}_{4}  + 3NO_{2} + 3H_{2} O

This is the balanced chemical equation.

b) oxidizing agent: N

    reducing agent: Au

Learn more about oxidation number here;

brainly.com/question/12854037

#SPJ4

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