Nitrogen oxides. Nitric acid
Answers are for parents and teachers.
1
How many grams of O₂ form from 404 g KNO₃ (2KNO₃ → 2KNO₂ + O₂, M = 101)?
64 g
2
Calculate Mᵣ(HNO₃). Aᵣ: H 1, N 14, O 16.
63
3
How do the oxidation states of nitrogen change in 2NO₂ + H₂O → HNO₃ + HNO₂?
+4 → +5 and +4 → +3; NO₂ is both oxidizing and reducing agent.
4
Why is silver released as a metal in 2AgNO₃ → 2Ag + 2NO₂ + O₂?
Silver stands after copper in the activity series; its oxide is unstable, so the nitrate decomposes to the metal.
5
Why must concentrated nitric acid never be used at home?
It burns skin, releases poisonous NO₂ and can set combustible materials alight.