Presentation on theme: "Day 2. Solubility and Factors affecting solubility Solubility- the amount of a substance required to form a saturated solution with a specific amount."— Presentation transcript:
Solubility and Factors affecting solubility Solubility- the amount of a substance required to form a saturated solution with a specific amount of solvent at a specific temp. ex: the solubility of sugar in water is 204 g/100 ml of water at 20 o C.
1) STIR (agitate)- Brings “fresh” solvent into contact with the solute increasing collisions between particles Factors affecting the RATE OF DISSOLUTION (how fast is dissolves) :
2) HEAT - Increases the kinetic energy (particles start moving faster) of the solvent molecules causing more frequent collisions between the solvent and solute
3) Crush/Grind It reduces the particle size and increases the surface area of the solute exposed to the solvent causing more frequent collisions between particles
General Solubility Rule “Like dissolves like”- solubility of a substance is related to the nature of the solvent.
The Solution Process “like dissolves like”- like refers to the polarity of the solute and solvent Polar solvents will dissolve POLAR & IONIC solutes water will dissolve salt water will dissolve sugar Nonpolar solvents will dissolve NONPOLAR solutes gasoline will dissolve oil
The Solution Process miscible (soluble)- dissolves in all proportions ethanol is miscible in water because they are both polar
The Solution Process Immiscible (not soluble)- vegetable oil is immiscible in water.
The Solution Process oil will not dissolve in water because oil is nonpolar and water is polar
Activity 1: Place a Styrofoam cup in Beaker A. What happens? If beaker A contains water, what can you tell me about the substance Styrofoam? Now place the cup in Beaker B. What happens? Without me telling you what the liquid in Beaker B is, what do you already know about it? Draw and label a picture of this at the bottom of your notes.
Activity 2: Make a small oval shaped pile of shaving cream directly on your table. Spread out with your wood stick. Select 2-3 colors of food coloring and drop 5-6 drops in different locations on the pile. Using a coffee stirrer, MARBLE (don’t whip!) the food coloring through the shaving cream making a swirl pattern.
Write your name decoratively on an index card with Sharpie. Dip the card into the shaving cream (name side down). Use a ruler to scrape off the shaving cream. Cellulose (in paper)