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Solutions and Concentration

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

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Solutions and Concentration

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  1. Solutions and Concentration

  2. 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

  3. Recall Secondary 1-3 • Homogeneous mixture • A mixture where you cannot see the difference between the different substances involved in the mixture

  4. More definitions • Aqueous solution • Aqua = water • A solution where water is the solvent

  5. Example of a solution • 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? Nesquik powder Milk Chocolate Milk

  6. More/less concentrated • What does it mean when something is more concentrated than something else? • Example

  7. What is concentration? The amount of substance within a given volume C:concentration m: massof solute V: volume of solution

  8. More/less concentrated? m=8g V=4L m=2g V=1L 1L C= C=2g/L C=2g/L 4L

  9. Consider 3 containers of water, 3 L 2 L 1 L

  10. Consider 3 containers of water, each with cubes of sugar dissolved into them. 3 L 2 L . . 1 L Each cube represents an equal amount of sugar dissolved in the water.

  11. The water from which container would taste the sweetest? The water from which container would taste the least sweet? 3 L 2 L 1 L

  12. 12 5 7 = 3.5 = 5 = 4 3 L 1 L L 2 L L L 3 L Least Sweet Sweetest 2 L 1 L Highest Concentration of Sugar Lowest Concentration of Sugar

  13. Practice Problem – Calculating Concentration m= V=1.5L 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?

  14. Converting Units x1000 x1000 kg g mg 1000 1000

  15. Converting Units x1000 x1000 kL L mL 1000 1000

  16. Practice Problem – Calculating Concentration V=50ml Remember, we need liters! V= V= m= 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?

  17. 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 V= V= m=

  18. Rearranging the Equations

  19. Rearranging the Equation to solve for Mass CV m=

  20. Example Emma wants to make 125ml of a 8g/L saline solution. How much salt will she need to use? m=CV C= 8g/L m= ? V = 125ml = 0.125L m= m=1g

  21. Rearranging the Equation to solve for Volume V=

  22. 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? m=CV C= 8g/L m= ? V = 125ml = 0.125L m= m=1g

  23. Practice • Workbook: • p.23-24 on conversion of units • (also p.25-26 if you need more practice!) • p. 27

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