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March 29, 2017

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In an experiment i had a test tube with Ca(NO3)2 solution in it and I added NaOH and a piece of aluminium.

After carefully heating the solution ammonia gas was formed

Can you help me write the equation for the reaction? I don't know the other products just the ammonia gas

thanks for the help

marysia

  • Chemistry ammonia gas - ,

    Al + NaOH produces H2 gas + Al(OH)4^- which a relatively standard reaction.
    Al, however, is a strong reducing agent and with the NO3^- from the Ca(NO3)2, it can reduce the NO3^- to NH3. (I don't think this is a good reaction for preparing NH3--there are better ways of doing it.) The two half equations are
    Al ==> Al^+3 + 3e
    8e + NO3^- + 6H2O ==>NH3 + 9OH^-
    I think both of those half equations are balanced. You need to multiply the top equation by 8 and the lower equation by 3 and add the two together to obtain the full equation.

  • Chemistry ammonia gas - ,

    thx :)

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