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CONCENTRATION

CONCENTRATION. The specific amount of solute (grams) dissolved in a specific amount of solvent (millilitres) Ex. 18g / 142mL 18g of a solute was dissolved in 142mL of solvent. Can also be expressed as a % Ex. Vinegar – 5% acetic acid 5mL out of 100mL is real acid The rest (95ml) is water

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CONCENTRATION

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  1. CONCENTRATION • The specific amount of solute (grams) dissolved in a specific amount of solvent (millilitres) • Ex. 18g / 142mL • 18g of a solute was dissolved in 142mL of solvent

  2. Can also be expressed as a % • Ex. Vinegar – 5% acetic acid • 5mL out of 100mL is real acid • The rest (95ml) is water • Very low concentrations may be stated in ‘parts per million’ or ppm • Often used for pollutants • Ex. DDT is found in the environment @ 2ppm • 2 parts of DDT is found in 1 million parts of the environment

  3. 2 main types of concentrations: 1) Concentrated • Large amount of solute in the solvent • Ex. Frozen orange juice concentrate • Large amount of orange solids in water

  4. 2) Diluted • Small amount of solute in the solvent • Ex. Orange juice made from concentrate • Small amount of orange solids in a large amount of water

  5. How could you make the diluted solution more concentrated? • How could you make the concentrated solution more dilute?

  6. Comparing concentrations • Need to be able to compare concentrations of to determine behavior • Which has the larger concentration? • In order to compare, the volume of the solvent must be the same for each solution

  7. Solution 1 Solution 2 • Which solution is more concentrated? 19g of salt in 100mL water 8g of salt in 40mL water 20g of salt in 100mL water

  8. Solution 1 Solution 2 • Which solution is more concentrated? 14g of salt in 65mL water 20g of salt in 85mL water

  9. Who’s Is Stronger? • Each group will make 4 different concentration of Tang • Label each cup (A1, A2, etc) • Measure out solute and solvent; mix • Groups will then rotate to another group’s drinks and order the drinks from most to least concentrated based on appearance • Then check with calculations to determine if they were correct • Enjoy! 

  10. A Taste of Concentration • Task - Create a glass of Tang that has your ideal concentration • Procedure • Start by making a solution of 5g/200ml • Increase the concentration until you have reached your ideal drink • Add 1g increments of iced tea powder • Maximum concentration = 15g/200ml • Calculate your ideal concentration in g/200ml, g/ml, and % • Enjoy! 

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