Test for Ammonia Gas

• anpanman

  11 Sep 08, 19:07

  Please help me verify whether the process described below is the test for ammonia gas.

  GCSE SCIENCE CHEMISTRY HIGH SCHOOL - Test and Collection of Ammonia Gas - gcsescience.com.

  Specific test.

  Ammonia will form a white smoke
  in the presence of hydrogen chloride gas,  HCl_(g).
  The white smoke is ammonium chloride,  NH₄Cl_(s).

  Adapted from http://www.gcsescience.com/itestammonia.htm

  Why is it that NH4Cl is a solid? Under the solubility table, isn't insoluble chlorides salt confined to just lead and silver salts?

   

  thanks.

   

• SBS1984E

  11 Sep 08, 19:10

  Because the Ammonium Chloride is NOT dissovled in water. So its not (aq) aqueous.

• UltimaOnline

  11 Sep 08, 22:20

  As SBS1984E stated, there is no water present, otherwise, as anpanman stated, the ammonium chloride would dissolve in water.

   

  Again, since you react GASEOUS HCl(g) with GASEOUS NH3(g), no water is present, hence you get dense white fumes of NH4Cl(g).