Solubility Post Lab Questions

• Surface Area

  • increases solubility and dissolution rate of solids

    • ​As particle size decreases, surface area↑ increases, dissolving rate ↑ increases

• Temperature for solids and liquids

  • Adding heat to increase the temperature increase solubility and dissolution rat

    • Increasing the temperature causes the atoms/molecules to increase movement and will increase solubility

• Temperature for Gasses

  • Adding heat to increase the temperature but decreases the solubility and dissolution rate of gasses

    • Increasing the temperature causes the atoms/molecules to increase movement gas atoms/molecules move further apart preventing mixing.

• 1) use the data table

• 2) Ask in part 1 did you apply any of the following factors that affect solubility and dissolution of solids/liquids.

​Agitation
Physically mixing

​Temperature
Increase or decrease temperature

​Surface Area
Change in particle size

A small polar covalent molecule (does not share electrons equally)

Partial charges

• 3) What can we assume about the type of solute kool-Aid is compared to that of water (“Like dissolves Like”)?

​Does Kool-Aid dissolve in water? (water is a polar covalent molecule)

Polar solvent dissolve polar solutes (polar covalent molecules, salts/ionic molecules, acids, and bases)

Non-polar solvents dissolve ONLY non-polar solutes

• 1) In the lab what is the solute:

​Solute is the substance that is being dissolved.

​Kool-Aid Powder

Water

• 2) In the lab what is the solvent:

​Solvent is the substance that is used to dissolve a solute.

​Kool-Aid Powder

Water

• 3) Define the rate of dissolution.

how fast a solute dissolves in the solvent

• 4) What are three factors that affect solubility of a solid or liquid?

​Agitation
Physically mixing

​Temperature
Increase or decrease temperature

​Surface Area
Change in particle size

• 5) Solubility Rule