[khem_newbie]

Hi,

I was doing an experiment on solubility of potassium bitartrate. When potassium nitrate was used as a solvent, due to common ion effect, solubility of potassium bitartrate decreases.


when a "Graph of the solubility of Potassium Bitartrate against the concentration of Potassium Nitrate" was plotted, i got a straight line with a negative gradient. I understand in theory, a curve should be obtained, any idea why?

Also, if glucose is used as the solvent, i think solubility of potassium bitartrate remains unchanged with varying concentrations of glucose. Am i right? If so, why is it so?

Please advice,

Thanks in advance.

[AWK]

What about the common ion effect?

[khem_newbie]

well, since there is a common ion, potasssium, according to Le Chatelliers Principle, e equilibrium will shift to the left and disfavor the formation of potassium and bitartrate ions. Hence solubility decreases.