DO NOW: (on back of NOTES) What does it mean if a solution is saturated? What does it mean if a solution is unsaturated? What does it mean if a solution is supersaturated?

Unit: Acids, Bases, and Solutions Notes Unit: Acids, Bases, and Solutions Solubility Curves

After today you will be able to… Interpret a solubility graph to determine whether a solution is unsaturated, saturated, or supersaturated. Interpret a solubility graph to determine the amount of solute needed to saturate a solution at a specific temperature.

Solubility refers to the maximum amount of solute that will dissolve in a given amount of solvent at a certain temperature and pressure.

The units of solubility are grams of solute/100g of solvent.   Remember, the solute dissolves into the solvent!

Remember 2 Important Factors that Affect Solubility: Temperature: Solids become more soluble as temperature increases: solubility of solids increase with increasing temperature.   For gases: as a solution with dissolved gas is heated, the particles gain kinetic energy, allowing them to escape from solution. As temperature increases, solubility of gases decreases. This is why a hot coke left open will taste flat.

Remember 2 Important Factors that Affect Solubility: 2. Pressure affects solubility of gases only. Solubility of gases increases as pressure increases. In bottling sodas, carbon dioxide is added to the solution under high pressure.

Interpreting Solubility Curves: 1. Any point on the curve refers to a saturated solution. (full)

Interpreting Solubility Curves: 2. Any point below the curve refers to an unsaturated solution (not yet full)

Interpreting Solubility Curves: 3. Any point above the curve refers to a supersaturated solution (over full)

Interpreting Solubility Curves: 4. The difference between the point above the curve and on the curve represents the amount of solute which will precipitate out (fall out of solution)

Interpreting Solubility Curves: 5. Solutes whose curves move upward with increased temperature are typically solids because the solubility of solids increases w/ increased temperature.

Interpreting Solubility Curves: 6. Solutes whose curves move downward with increased temperature are typically gases because the solubility of gases decreases with increased temperature.

Battleship Directions: 1. Choose 1 solute (this is your “battleship”) 2. Ask your partner about an amount of grams of solute and a temperature. Your partner will answer “unsaturated,” “saturated,” or “supersaturated.”

Battleship Directions: 3. Use your partner’s answer to figure out where their “battleship” is!

My Battleship/Solute is:________________ My Partner’s Battleship/Solute is:________ Example Game:

Questions? Begin WS!

Silence is GOLD-en!