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Warm-up

Warm-up. Define solute and solvent What is a super saturated solution? At what temp. will I have a saturated solution of KCl by dissolving 50 g in 100 g of water?. Molarity and Molality. Unit 9, Day 2 Kimrey 12 December 2012 HAPPY 12/12/12!!!!!. Concentration. Parts of a Solution

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Warm-up

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  1. Warm-up • Define solute and solvent • What is a super saturated solution? • At what temp. will I have a saturated solution of KCl by dissolving 50 g in 100 g of water?

  2. Molarity and Molality Unit 9, Day 2 Kimrey 12 December 2012 HAPPY 12/12/12!!!!!

  3. Concentration • Parts of a Solution • Solute: substance dissolved in a solution • Solvent: substance doing the dissolving • Concentration: how much solute is dissolved in the solution • Dilute (weak): small amount dissolved • Concentrated (strong): large amount dissolved

  4. Molarity • moles of solute/liters of solution • Often in grams, need to change to moles • Don’t forget the mole hill!!! • Often in mL, need to change to liters • KHDbdcm

  5. Example • A sample of NaNO3 weighing 0.38 g is placed in a 50.0 mL flask. The flask is then filled with water to the mark on the neck, dissolving the solid. What is the molarity of the resulting solution?

  6. Example • An experiment calls for the addition to a reaction vessel of 0.184 g of NaOH in aqueous solution. How many milliliters of 0.150 M NaOH should be added?

  7. Example • What is the molarity of a solution that contains 4.5 moles of sucrose in 750mL of water?

  8. Example • Calculate the molarity of a solution prepared by dissolving 4.56 grams NaOH into enough water to make a 56.78 mL solution.

  9. Example • What is the molarity of a bleach containing 9.5 grams of NaOCl per liter of bleach?

  10. Example • How many grams of CaCl2 would be dissolved in 0.75 L of water to make a 1.5 M solution?

  11. Example • How many grams of NaOH do I need to make250 mL of a 3.0 M solution

  12. Molality • Generally speaking substances expand as they are heated. • To make up for this we can also measure concentration in Molality • Molality: moles of solute dissolved in kilograms of solution

  13. To Calculate Molality • Moles of solute / kg of solution • Might have to convert to moles!!! • Might also have to convert to kilograms!

  14. Example • What is them molality of a solution containing 10.0 g of Na2SO4 dissolved in 1000.0 g of water?

  15. Example • What is the molality of a solution containing 30.0 g of C10H8 in 500 g of toluene?

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