8.2 Solubility and Concentration

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1 Fresh lemonade is a solution of water, lemon juice, and sugar. There is a limit to the amount of sugar that can dissolve in a given amount of water. Once that limit is reached, you cannot make the solution taste any sweeter. How are solutions with different amounts of solute described? Solutions are described as saturated, unsaturated, or supersaturated, depending on the amount of solute in solution. The maximum amount of a solute that dissolves in a given amount of solvent at a constant temperature is called solubility. Solubilities are usually expressed in grams of solute per 100 grams of solvent at a specified temperature. 1

2 At a given temperature, different substances have different solubilities in water. At a given temperature, different substances have different solubilities in water. At a given temperature, different substances have different solubilities in water. 2

3 Saturated Solutions A saturated solution is one that contains as much solute as the solvent can hold at a given temperature. At 20 C, grams of table sugar will dissolve in 100 grams of water. If you add more sugar, it will not dissolve. Unsaturated Solutions A solution that has less than the maximum amount of solute that can be dissolved is called an unsaturated solution. As long as the amount of solute is less than the solubility at that temperature, the solution is unsaturated. Supersaturated Solutions A supersaturated solution is one that contains more solute than it can normally hold at a given temperature. A solvent can sometimes dissolve more solute than you might expect, based on its solubility. If you heat a solution, more solute may dissolve. Carefully cool the solution without jarring it and the extra solute in solution remains. 3

4 Supersaturated solutions are very unstable. When a single crystal of sodium acetate is added to a supersaturated solution of sodium acetate in water, the excess solute rapidly crystallizes. Factors Affecting What factors determine the solubility of a solute? Three factors that affect the solubility of a solute are the polarity of the solvent, temperature, and pressure. 4

5 Polar and Nonpolar Solvents Oil does not dissolve in water because oil molecules are nonpolar and water molecules are polar. Solutions are more likely to form when the solute and solvent are either both polar or both nonpolar. A soap molecule has a polar end, which attracts water molecules, and a nonpolar end, which attracts oil. Generally, a solute is more likely to dissolve in a like solvent than an unlike solvent, so like dissolves like. Soaps and detergents are used to remove grease and oil stains. 5

6 Temperature In general, the solubility of solids increases as the solvent temperature increases. However, gases become less soluble as the temperature of the solvent increases. Pressure Increasing the pressure on a gas increases its solubility in a liquid. The pressure of CO 2 in a sealed 12-ounce can of soda at room temperature can be two to three times atmospheric pressure. What are three ways to measure the concentration of a solution? The concentration of a solution is the amount of solute dissolved in a specified amount of solution. Concentration can be expressed as percent by volume, percent by mass, and molarity. 6

7 Percent by Volume Most bottled or canned juices are made by adding water to natural fruit juices. These solutions are less concentrated than natural fruit juices. Percent by volume is a way to measure the concentration of one liquid dissolved in another. Use the following equation to calculate concentration as a percent by volume. BONUS If you would like a bonus opportunity, for 5 points, then find a label on a beverage container that involves juice and determine the amount of real juice that is in the beverage. Unacceptable percentages would be 0% and 100%. Show the equation and calculate the volume of solute (real juice) in the container. The label must be attached to your work. 7

8 Percent by Mass Concentration expressed as a percent by mass is more useful when the solute is a solid. Percent by mass is the percent of a solution s total mass that is accounted for by a solute. Molarity To compare the number of solute particles in solutions, chemists often use moles to measure concentration. Molarity is the number of moles of a solute dissolved per liter of solution. To make a 2-molar (2M) solution of potassium nitrate in water, first calculate the molar mass of the solute. Potassium nitrate, KNO 3, has a molar mass of grams. If grams of potassium nitrate is mixed with enough water to make 3.5 liter of solution, the resulting solution is 2-molar. 8

9 To make a 2-molar (2M) solution of potassium nitrate in water, first calculate the molar mass of the solute. Potassium nitrate, KNO 3, has a molar mass of grams. If grams of potassium nitrate is mixed with enough water to make 3.5 liter of solution, the resulting solution is 2-molar. 3.5 liter of a 2M KNO 3 solution contains 707 grams of KNO 3. 9

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