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.

your aparatus and method sound just fine to me

Excellent , thanks for the help!

now if they only let you do the actual reaction in class... could be fun to do

selenide?... anyhoo, i hate doing 'theory' work it really gives me a headache, well just boring theory work eg. most of my coursework...

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

Hey, Guess you must be studying via the OU!

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!