savethegibbons Posted May 28, 2004 Share Posted May 28, 2004 In this piece of homework I am asked to describe the process I would use to prepare a sample of dry hydrogen selenide. I am given serveral materials to do so : Liquids : concentrated nitric ccid concentrated hydrochloric acid water Solids : calcium chloride granules sodium chloride aluminium selenide sodium hydroxide Solid aluminium selenide will react with water to form solid aluminium hydroxide [Al(OH)3] and hydrogen selenide gas (H2Se). I need to isolate and dry the hydrogen selenide gas (which is denser than air). How would I do this? EDIT : After some thought, I've considered this : I'll use two addition funnels, the top with water in it, and the bottom with aluminium selenide. Water will be allowed through by undoing the valve, and the two substances will react. The valve on the water funnel will then be closed and the gas will escape through a tube on the side. The hydrogen selenide gas will then pass through a u-tube filled with calcium chloride granules to dry the gas. Finally, another tube will take the gas into a jar for collection . Would this work? Thanks. Link to comment Share on other sites More sharing options...
YT2095 Posted May 29, 2004 Share Posted May 29, 2004 your aparatus and method sound just fine to me Link to comment Share on other sites More sharing options...
savethegibbons Posted May 30, 2004 Author Share Posted May 30, 2004 Excellent , thanks for the help! Link to comment Share on other sites More sharing options...
budullewraagh Posted June 4, 2004 Share Posted June 4, 2004 now if they only let you do the actual reaction in class... could be fun to do Link to comment Share on other sites More sharing options...
MulderMan Posted June 4, 2004 Share Posted June 4, 2004 selenide?... anyhoo, i hate doing 'theory' work it really gives me a headache, well just boring theory work eg. most of my coursework... Link to comment Share on other sites More sharing options...
YT2095 Posted June 5, 2004 Share Posted June 5, 2004 yeah, I`de have gone the sodium selenide way, same way as I go sodium Phosphide or Sulphide to make Hydrogen sulphide or Phosphine. eitherway your aparatus will serve you well for your project Link to comment Share on other sites More sharing options...
Bridget Jones Posted June 21, 2004 Share Posted June 21, 2004 Hey, Guess you must be studying via the OU! Link to comment Share on other sites More sharing options...
Bridget Jones Posted June 21, 2004 Share Posted June 21, 2004 In this piece of homework I am asked to describe the process I would use to prepare a sample of dry hydrogen selenide. I am given serveral materials to do so : Liquids : concentrated nitric ccid concentrated hydrochloric acid water Solids : calcium chloride granules sodium chloride aluminium selenide sodium hydroxide Solid aluminium selenide will react with water to form solid aluminium hydroxide [Al(OH)3] and hydrogen selenide gas (H2Se). I need to isolate and dry the hydrogen selenide gas (which is denser than air). How would I do this? EDIT : After some thought' date=' I've considered this : I'll use two addition funnels, the top with water in it, and the bottom with aluminium selenide. Water will be allowed through by undoing the valve, and the two substances will react. The valve on the water funnel will then be closed and the gas will escape through a tube on the side. The hydrogen selenide gas will then pass through a u-tube filled with calcium chloride granules to dry the gas. Finally, another tube will take the gas into a jar for collection . [/b'] Would this work? Thanks. Hey, Guess you must be studying via the OU! Link to comment Share on other sites More sharing options...
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