Sodium Sulphide, Color/Temp

[YT2095]

I`m uncertain as to the practicality of this, but whilst making a solution of Sodium Sulphide and adding more sulpher and heating until no more will dissolve, there is a VERY distinct color change!

when cool (30c) the color is orange, a rather nice clear orange color, and when heated it seems to turn deep red then almost brown.

now I know of quite a few chems that will do this at extremes, or with acid/alkali or light or moisture etc... Cobalt Chloride being one example, but simple Sodium Sulphide! needless to say, when it cools sufficiently I`ll put it in the fridge and see it it goes pale orange. you`ll only need some simple sodium hydroxide and sulpher in water to do this (try keep it as concentrated as possible though for greatest effect . I use it as a precursor for making metal sulphides, but I just happened to notice this color change and figured some of you may wish to try it and experiment with it yourselves, it`s really rather remarkable stuff! from such simplicity

 

Enjoy

[Guest ChemestryGoblin]

Can Someone help me please!!!

How do you transform Hydrated Copper in to unhydrated copper and back again?

[YT2095]

Hydrated copper?

do you mean copper hydroxide?

[Crash]

Originally posted by ChemestryGoblin

Can Someone help me please!!!

How do you transform Hydrated Copper in to unhydrated copper and back again?

 

well from hydrated to unhydrated just boil of the water in a dish, forgotten the name of the special dish........

And vice versa just dissolve

 

And Copper what? sulfate? i could help more if you gave me more info cause it aint possible with good ol copper.

[YT2095]

back on topic, the sodium sulphide soln can be added to Zinc Sulphate (or many other sulphates) soln and precipitate out the metal sulphide (Zinc Sulphide for instance). however as of yet I`ve had no luck using this method of making "glow in the dark" zinc sulphide as the product is 100% pure when washed, and it needs to be doped with copper or manganesse to make it photo luminescent, it will scintilate on exposure to a radio isotope source though so it`s not really wasted exactly, just not quite the product I wanted.