Why does HNO3 does not release Hydrogen gas when it reacts with any metal except Mg and Mn?
Asked by | 20th Aug, 2011, 01:53: AM
Expert Answer:
When nitric acid reacts with strongly electropositive metals like Mg and Mn ,the Hydrogen ion get reduced to Hydrogen gas.
Mg + 2 H+ ? Mg2+ + H2
Whereas with other less electropositive metals like Cu etc the products depend on temperature and the acid concentration. For example, copper reacts with dilute nitric acid at ambient temperatures with a 3:8 stoichiometry.
3 Cu + 8 HNO3 ?3 Cu2+ + 2 NO + 4 H2O + 6 NO3-
When nitric acid reacts with strongly electropositive metals like Mg and Mn ,the Hydrogen ion get reduced to Hydrogen gas.
Mg + 2 H+ ? Mg2+ + H2
Whereas with other less electropositive metals like Cu etc the products depend on temperature and the acid concentration. For example, copper reacts with dilute nitric acid at ambient temperatures with a 3:8 stoichiometry.
3 Cu + 8 HNO3 ?3 Cu2+ + 2 NO + 4 H2O + 6 NO3-
Answered by | 23rd Aug, 2011, 04:19: PM
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