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Molarity

Molarity. Agenda Complete lab measurements Notes on Molarity Practice molarity. Complete lab measurements. 5 minutes. Molarity. Date:. Molarity. Definition: moles of solute dissolved in one liter of solvent. Units are moles/liter or Molarity M is the abbreviation for Molarity.

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Molarity

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  1. Molarity Agenda • Complete lab measurements • Notes on Molarity • Practice molarity

  2. Complete lab measurements 5 minutes

  3. Molarity Date:

  4. Molarity • Definition: moles of solute dissolved in one liter of solvent. • Units are moles/liter or Molarity • M is the abbreviation for Molarity. • With nail polish and nail polish remover, which is the solvent and which is the solute? • What about with kool-aid?

  5. Relation to Mole Town • Add a new town between the Valley of Volume and DC. • Do not cross the STP dateline to get to the Molehills of Molarity. • When you leave Mole Town DIVIDE, by the volume in liters. • To return to Mole Town, MULTIPLY by the volume in liters.

  6. Hints • Remember that Molarity is a derived unit – two units put together. • ALWAYS start problems with single unit givens • Separate Molarity into moles and liters, putting only one unit in each box of the bridge.

  7. When 3.0 moles of NaCl are dissolved in 1.0 L of H2O, what is the molarity? 3.0 M

  8. When 2.0 moles of NaCl are dissolved in 0.50 L of H2O, what is the molarity? 4.0 M

  9. When 5.0 moles of NaCl are dissolved in 2.5 L of H2O, what is the molarity? 2.0 M

  10. When 2.0 moles of NaCl are dissolved in 100. mL of H2O, what is the molarity? 0.20 M

  11. When 0.50 moles of NaCl are dissolved in 50. mL of H2O, what is the molarity? 10. M

  12. When 5.8 grams of NaCl are dissolved in 100. mL of H2O, what is the molarity? 1.0 M

  13. When 2.9 grams of NaCl are dissolved in 50. mL of H2O, what is the molarity? 1.0 M

  14. Dilution • What does it mean to you if something is diluted? • Dilution is changing the molarity by adding or removing some of the solvent. Note, the number of moles remains constant. • M1V1 = M2V2

  15. You are given a solution of 14.8 M NH3. How many milliliters of this solution do you require to give 100.0 mL of 1.00 M NH3 when diluted? 6.76 mL

  16. You have a solution that is 1.5 M H2SO4. How many milliliters of this acid do you need to prepare 100.0 mL of 0.18 M H2SO4? 12 mL

  17. You wish to prepare 0.12 M HNO3 from a stock solution of nitric acid that is 15.8 M. How many milliliters of the stock solution do you require to make up 1.00 L of 0.12 M HNO3? 7.6 mL

  18. A chemist want to prepare 0.250 M HCl. Commercial hydrochloric acid is 12.4 M. How many milliliters of the commerical acid does the chemist require to make up 1.50 L of the dilute acid? 30.2 mL

  19. A chemist needs to create 500 mL of 0.5 M HCl from 5.0 M HCl. How much water must the chemist add to complete the dilution? 450 mL of water

  20. Partner Time • Work on the provided worksheet in the time remaining. • Homework: Lab Report

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