Organic Chemistry Question

[Buttzilla]

If a solute is soluble in cold solvent, is it necessary to test the solubility of he solute in the same solven when hot? Explain...

one of the questions i need to answer for my ochem lab! help plz

 

[Colt45]

no

 

[MichaelD]

If a cold Woodchuck could chuck hot wood while having wood in the woods, could a hot Woodchukc chuck cold wood without wood while NOT in the woods?

Makes you think, doesn't it?

 

[simms]

no, because the moles in both solvent/solute won't change. unless the products and reactants form gas or have a low BP, it should be ok. solubility is based on the reaction and PKa. .. which is related to concentration of [prod]*[prod]/[reactants].

 

[Chaotic42]

Experiment 2 may help

Note: IANAOCS

 

[gururu]

sodium chloride exhibits different solubilities in water depending on temperature. it is actually less soluble in hot water than in room temperature water. I think that should answer your question.

EDIT: THIS IS WRONG. SEE CHAOTIC42 message below!

thanks chaotic42!!!

 

[Chaotic42]

Originally posted by: gururu
sodium chloride exhibits different solubilities in water depending on temperature. it is actually less soluble in hot water than in room temperature water. I think that should answer your question.

According to this it increases slightly up to 100C.

 

[Buttzilla]

Originally posted by: Chaotic42
Experiment 2 may help

Note: IANAOCS

wow, a printable lab manual. we had to buy ours which cost 100 bucks.

 

[Siva]

Solubility of liquids increase as temperature rises
Solubility of gases in liquids decrease as temperature rises.

Its the rule.

 

[Anonemous]

Originally posted by: Buttzilla

Originally posted by: Chaotic42
Experiment 2 may help

Note: IANAOCS

wow, a printable lab manual. we had to buy ours which cost 100 bucks.

ditto 🙂

 

[JCase]

Originally posted by: Siva
Solubility of liquids increase as temperature rises
Solubility of gases in liquids decrease as temperature rises.

Its the rule.

That's all you need to know...and in Ochem you don't do much dissolving of gasses, but you will do a whole lot of recrystallization with liquid solvents that work on the exact principle above...Just in the opposite direction.