Solutions and Concentration What is a solution Homogeneous mixture of solute and solvent Solute substance dissolved Often a solid Solvent substance in which the solute is dissolved Usually a liquid ID: 763631
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Solutions and Concentration
What is a solution? Homogeneous mixture of solute and solvent Solute: substance dissolved Often a solid Solvent: substance in which the solute is dissolved Usually a liquid
Recall Secondary 1-3 Homogeneous mixture A mixture where you cannot see the difference between the different substances involved in the mixture
More definitions Aqueous solution Aqua = water A solution where water is the solvent
I take a spoonful of Nesquik powder and mix it into my milk to make chocolate milk. What is the solute? What is the solvent?What is the solution? Example of a solutionNesquik powder MilkChocolate Milk
What does it mean when something is more concentrated than something else? Example More/less concentrated
What is concentration? The amount of substance within a given volume C : concentration m : mass of solute V : volume of solution
More/less concentrated? 4L 1L m=8g V=4L m=2g V=1L C= C=2g/L C=2g/L
Consider 3 containers of water , 3 L 2 L 1 L
Consider 3 containers of water , each with cubes of sugar dissolved into them. Each cube represents an equal amount of sugar dissolved in the water. . . 1 L 3 L 2 L
1 L 3 L The water from which container would taste the sweetest? The water from which container would taste the least sweet? 2 L
1 L 2 L 3 L 1 L 5 = 5 L 2 L 7 = 3.5 L 3 L 12 = 4 L Sweetest Least Sweet Highest Concentration of Sugar Lowest Concentration of Sugar
Practice Problem – Calculating Concentration 1. Ian is feeling a little under the weather and decides to make himself some tea. To make it a little more appealing he decides to add 15g of sugar to his teapot which contains 1.5L of tea. What is the concentration of his sweetened tea in g/L? V=1.5L m=
Converting Units kg g mg x1000 x1000 1000 1000
Converting Units kL L mL x1000 x1000 1000 1000
Practice Problem – Calculating Concentration 2. Latiyfa made herself 50ml of Kool-Aid by dissolving 2.5g of the powder into water. What is the concentration of the Kool-Aid in g/L? V=50ml V= Remember, we need liters! V= m=
3. David is having a party and is making Minute Made juice. He mixes in 100g of the concentrate with some water to produce 2000mL of juice. What is the final concentration (g/L) of the juice? Practice Problem – Calculating Concentration V=2000ml m= V= V=
Rearranging the Equations
Rearranging the Equation to solve for Mass m= CV
Example Emma wants to make 125ml of a 8g/L saline solution. How much salt will she need to use? C= 8g/L m= ? V = 125ml = 0.125L m=CVm=1g m=
Rearranging the Equation to solve for Volume V=
Example What is the maximum volume that Cory can make of an 80g/L solution of chocolate milk if he only has 23g of Nesquik powder? C= 8g/Lm= ?V = 125ml = 0.125Lm=CVm=1g m=
Practice Workbook: p.23-24 on conversion of units (also p.25-26 if you need more practice!) p. 27