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Daily Science pg. 108

Daily Science pg. 108. Grab a sheet over paper from the front desk. Put it on pg. 108. Complete it. Molarity. Pg. 109. Molarity. Tells you the concentration of a solution M The number of moles of solute dissolved per liter of solution Read as molar Must be in liters!.

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Daily Science pg. 108

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  1. Daily Science pg. 108 • Grab a sheet over paper from the front desk. • Put it on pg. 108. • Complete it

  2. Molarity Pg. 109

  3. Molarity • Tells you the concentration of a solution • M • The number of moles of solute dissolved per liter of solution • Read as molar • Must be in liters!

  4. Calculating molarity • M = moles or solute/ liters of solution • Unit= mol/L or M • Ex. What is the molarity of a solution containing 40.0 g of glucose (C6H12O6) in a 1.5 L solution? • Ex. What is the molarity of a bleach solution containing 9.5 g of NaOCl per 500 ml of bleach

  5. Preparing solutions • If you know you need a certain molarity solution, you can calculate how many grams you need to measure out. • You fist have to add the solute to a volumetric flask • Then you can fill the volumetric flack to the line with water • Can’t just add the volume of solvent you need because the solute takes up space • Ex. How many grams of CaCl2 would be dissolved in 1.0 L of a 0.10 M solution of CaCl2? • Ex. How many grams of NaOH do you need to make a 1.5 L, 2.0 M solution of NaOH?

  6. Diluting solutions • Less concentrated solutions are diluted solutions • You can determine how much solvent you need to add to dilute a solution from a stock solution • M1V1 = M2V2 • Ex. What volume of a 3.000 M KI stock solution would you use to make 0.300 L of a 1.25 M KI solution? • Ex. How many milliliters of a 5.0 M H2SO4stock solution would you need to prepare 100.0 mL of 0.25 M H2SO4?

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