Unit 13. Solutions (including Molarity)

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Presentation transcript:

Unit 13. Solutions (including Molarity)

SOLUTIONS AND SOLUBILITY

SOLUTION A homogeneous mixture All parts are uniformly mixed

Terms Solvent – the substance present in the largest amount in a solution. The substance that does the dissolving. Solute – the other substance or substances in a solution. The substance that is dissolved.

Terms Saturated Unsaturated When a solution contains the maximum amount of solute Unsaturated When a solvent can dissolve more solute

Few more terms… Concentrated Dilute When a relatively large amount of solute is dissolved Dilute When a relatively small amount of solute is dissolved

Factors Affecting the Rate of Dissolution Surface Area Stirring Temperature

But solid can reform… Crystallize - solid comes out of solution

Temperature vs Solubility Let’s practice reading this…

Using the graph to do some math… How much KNO3 will dissolve at 60oC in 100 grams of water? How much will dissolve in 50 grams water? What chemical will dissolve 60g in 100g of water at 24oC? How many grams of KCl will come out of a 90oC solution if it is cooled to 30oC?

MOLARITY (OR M)

We need to review Moles first… How do we convert between grams and moles?

MOLARITY Molarity-the number of moles of solute per liters of solution Ie. Concentrated HCl is 12M solution M = molarity = moles of solute liter of solution

Moles over liters Try and remember it this way.

The Molarity Triangle mol M L

So why is molarity so important? We need to be able to make solutions and dilutions…

DILUTIONS M1 x V1 = M2 x V2 Where M = molarity V = volume What volume of 16 M sulfuric acid must be used to prepare 1.5 L of a 0.10 M H2SO4 What volume of 12 M HCl must be used to prepare 0.75 L of a 0.25 M HCl?