Which solvent was better? Water Which solvent was better? Water or Rubbing Alcohol?or Rubbing Alcohol?

The ink dissolved into the water better The ink dissolved into the water better than the alcohol making it the better than the alcohol making it the better solvent.solvent.

Therefore the ink was more SOLUBLE in Therefore the ink was more SOLUBLE in water than in alcohol.water than in alcohol.

This is called solubility.This is called solubility.

SolubilitySolubility The solubility of a substance is the amount The solubility of a substance is the amount

of that substance that will dissolve in a of that substance that will dissolve in a certain amount of solvent at a given certain amount of solvent at a given temperature.temperature.

More of the ink dissolved in water. Less of More of the ink dissolved in water. Less of the ink dissolved in alcohol.the ink dissolved in alcohol.

Ink has a higher solubility in water than it Ink has a higher solubility in water than it does in alcohol.does in alcohol.

What does temperature have to do What does temperature have to do with it?with it?

Review:Review: Kinetic Theory of Matter!Kinetic Theory of Matter!

• States that all matter is made of particles in States that all matter is made of particles in motion.motion.

Temperature!Temperature!• A measure of the kinetic energy of the particles in A measure of the kinetic energy of the particles in

an object.an object.• The higher the temperature The higher the temperature The more kinetic The more kinetic

energy energy Faster movement of the atoms Faster movement of the atoms Higher solubilityHigher solubility

Remember…Remember… Remember the demonstration we did with the Remember the demonstration we did with the

kinetic theory of matter.kinetic theory of matter. Three beaker sat on the projectorThree beaker sat on the projector

One had boiling hot waterOne had boiling hot water One had ice cold waterOne had ice cold water One had room temperature waterOne had room temperature water

We put red food dye in each beaker and We put red food dye in each beaker and observed which beaker of water spread or observed which beaker of water spread or “dissolved” the color the fastest.“dissolved” the color the fastest.

The warmer the water the faster the dye The warmer the water the faster the dye dissolved because the particles were moving dissolved because the particles were moving faster.faster.

Temperature and SolutionsTemperature and Solutions Raising the temperature of a solution changes Raising the temperature of a solution changes

its solubility.its solubility.

In higher temperatures, two things happen:In higher temperatures, two things happen:1.1. Solute dissolves fasterSolute dissolves faster

2.2. A greater amount of solute can be dissolvedA greater amount of solute can be dissolved

This is why you add sugar to tea when it is hot.This is why you add sugar to tea when it is hot.

You can get it sweeter!You can get it sweeter!