Solubility of CS2: Temperature Effects

[Karan Punjabi]

The picture here is the solubility of CS2 as per the variation of temperature . As per my knowledge when we increase the temperature the ionic product of water increases i.e H+ and OH- ions increases so due to this the ion induced dipole interaction must increase hence the solubility must increase right? If I'm wrong at any point please correct me there and guide me. Thankyou

 

[Borek]

Yes (Kw goes up with temperature), no, it doesn't have to change the solubility of CS₂, especially as the amounts of ions are still pretty minute.

 

[Karan Punjabi]

Yes (Kw goes up with temperature), no, it doesn't have to change the solubility of CS₂, especially as the amounts of ions are still pretty minute.

Ohk if you are right then why its solubility is decreasing

 

[Borek]

Probably for the same reason solubility of most inert gases goes down with the temperature (even if CS₂ at STP is not a gas).

 

[Karan Punjabi]

Thats what...I want to know the reason...

 

[Borek]

Have you tried to google?

http://antoine.frostburg.edu/chem/senese/101/solutions/faq/temperature-gas-solubility.shtml

 

[James Pelezo]

Could CS₂ have poor solute-solvent interaction? It is a linear molecule with very weak diametrically opposing dipoles. As temperature increases the evaporation of CS₂ would increase leaving a lower concentration remaining in solution. Wikipedia - Physical Properties of CS₂ does show a rapid decrease in concentration as a function of temp. Here's the published trend.