How can I make a saturated solution of potassium iodide?

1 Answer
anor277
Jun 9, 2018

Well, get some of the salt....(which is rather expensive!)...

Explanation:

And add the salt to approx. #5-10*mL# of water UNTIL such time that there is undissolved solute.... As always, a saturated solution is a solution that contains the SAME amount of solute as would be in equilibrium with undissolved solute...

#KI(s) stackrel(H_2O) rightleftharpoonsK^+ + I^(-)#

When NO MORE solute dissolves, i.e. you can see crystals of #KI# after stirring, the supernatant solution in saturated with respect to #KI#. This site gives a solubility of approx. #1.5*g*mL^-1#... As always, #"saturation"#, and #"supersaturation"# refers to an equilibrium property.

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