Devarda's alloy
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Devarda's alloy is an alloy of aluminium (44%-46%), copper (49%-51%) and zinc (4%-6%). It is a reducing agent.
It can be used as a test for the nitrate anion. When a solution of nitrate ions are mixed with aqueous sodium hydroxide, adding Devarda's alloy and heating the mixture gently, liberates ammonia gas.
The reaction is given by the ionic equation:
- 3NO3- + 8Al + 5OH- + 18H2O -> 3NH3(g) + 8[Al(OH)4]-
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