When platinum is placed in aqua regia solution (a mixture of HCl and HNO3), the following redox equation takes place:
Pt + Cl– + NO3– → PtCl62– + NO.
When the reaction is balanced, what is the coefficient on the Cl–?
2020-07-13 4:10 pm
回答 (2)
2020-07-13 5:00 pm
✔ 最佳答案
Since there are 6 Cl-'s on the right, you need 6 Cl-'s on the left.
2020-07-13 6:17 pm
Oxidation half equation: Pt + 6Cl⁻ → PtCl₆²⁻ + 4e⁻
Reduction half equation: NO₃⁻ + 4H⁺ + 3e⁻ → NO + 2H₂O
(Oxidation half equation)×3 + (Reduction half equation)×4, and cancel 12e⁻ on each side. The balanced overall equation is:
3Pt + 18Cl⁻ + 4NO₃⁻ + 16H⁺ → 3PtCl₆²⁻ + 4NO + 8H₂O
The coefficient on the Cl⁻ = 18
Reduction half equation: NO₃⁻ + 4H⁺ + 3e⁻ → NO + 2H₂O
(Oxidation half equation)×3 + (Reduction half equation)×4, and cancel 12e⁻ on each side. The balanced overall equation is:
3Pt + 18Cl⁻ + 4NO₃⁻ + 16H⁺ → 3PtCl₆²⁻ + 4NO + 8H₂O
The coefficient on the Cl⁻ = 18
收錄日期: 2021-04-18 18:33:25
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20200713081039AA8RlTq