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# Solutions and colligative properties

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### Solutions and colligative properties

1. 1. Solutions and Colligative Properties
2. 2. What is a solution? A solution is a homogeneous mixture of two or more substances  A solution is made up of 2 parts: the solute and the solvent  A solute is the substance being dissolved  A solvent is the substance the solute is being dissolved in (it is often a liquid) 
3. 3. What does dissolve mean? To dissolve means to break apart. When salt dissolves in water, it is being broken up into smaller parts.  Those smaller parts are called atoms, and in the case of salt, they are beaking up into their individual ions. 
4. 4. Let’s take a closer look at the subatomic level  The balls in the picture represent the atoms involved in building a molecule (like salt). When they are placed in the solvent, they break into individual atoms (or balls).
5. 5. Real life examples exercise  Brainstorm some real life examples of solutions with your neighbors and be prepared to share them with the class.
6. 6. Solubility Rules Not all substances are soluable. Some create an insoluble compound called a precipitate. We need to be able to predicte if a compound will dissolve or form a precipitate.  Today we will use the solubility rules handout but you will need to begin memorizing the solubility rules for homework as you will not be given them on the test. 
7. 7. Determine if the following compounds are soluble Ammonium Chloride  Lead Chloride  Silver Iodide  Sodium Sulfide  Rhubidium Nitride 
8. 8. How do we describe how much solute is in the solution?  In order for us to determine how much of a solute is dissolved in a solution we use units of concentration.  Molarity (most useful and most used by chemists) describes the amount of solute dissolved per total liters of solution.  Molality is the amount of solute per liters of solvent.