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Balance concentrated HNO₃ acting on copper.

Exercise and reference answers

Left
  1. Coefficient
    4
    Formula
    HNO₃
  2. Coefficient
    1
    Formula
    Cu
Right
  1. Coefficient
    1
    Formula
    Cu(NO₃)₂
  2. Coefficient
    2
    Formula
    NO₂
  3. Coefficient
    2
    Formula
    H₂O
Instructions
Conc. nitric acid evolves brown NO₂.

Explanation

_Source: syllabus Science, Ch 3 'Metals and Non-Metals' §3.2.6_
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