2. Hexane/Iodine
Nonpolar solutes don’t dissolve in water (which is polar) because they are unable to compete with the strong attraction polar molecules have for one another.

3. Polar/ionic solutes don’t dissolve in nonpolar solvents because they have a stronger attraction for one another than for the nonpolar solvent molecules!

4. LIKE DISSOLVES LIKE Water and potassium won’t dissolve in hexane
Iodine: NONPOLAR (the iodine-iodine bond is pure covalent)
Hexane: NONPOLAR (the electronegativity difference between C-H is small*)
Water: POLAR (electronegativity difference between H-O is large so it has dipoles)
Potassium permanganate: IONIC (separates into ions when mixed with a polar solvent)

6. What is solution concentration?
Colligative properties

7. Calculating Concentration in moles per litre
This is the most common way of representing concentration in chemistry.
You need to determine the number of moles of solute present in a given volume of the solution.

8. example
A solution contains 5.85 g of sodium chloride dissolved in 5.00 x 103 mL of solution. Calculate the concentration of the solution in moles per litre.

9. Practice
A solution contains 12.0 g of sodium hydroxide in 2.5 x 102 mL of solution. Calculate the concentration of the sodium hydroxide solution.
What mass of potassium hydroxide is required to prepare 6.00 x 102 mL of a solution with a concentration of mol/L?u