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Molarity

Molarity. Agenda Review Notes on Molarity Practice molarity. NaBr + F 2 g NaF + Br 2. What type of reaction? How many spectator ions? What is the spectator ion? What is the net ionic equation?. Steps for Stoichiometry. Into moles Mole ratio Out of moles.

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Molarity

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  1. Molarity Agenda • Review • Notes on Molarity • Practice molarity

  2. NaBr + F2 g NaF + Br2 • What type of reaction? • How many spectator ions? • What is the spectator ion? • What is the net ionic equation?

  3. Steps for Stoichiometry • Into moles • Mole ratio • Out of moles

  4. What does concentrated mean?

  5. What is a solvent?

  6. Molarity Date:

  7. Molarity • Definition: moles of solute dissolved per one liter of solution. moles Molarity Liter

  8. Solute: substance being dissolved • Solvent: substance doing the dissolving. • Units are mol/L or M • Called molar

  9. With nail polish and nail polish remover, which is the solvent and which is the solute? • What about with kool-aid?

  10. 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.

  11. STP Dateline MASS DIVIDE MOLAR MASS MOLETIPLY MOLE TOWN DC DIVIDE MOLETIPLY 6.02*1023 RP/mol MOLETIPLY 22.4 L/mol LITERS MOLE HILLS OF MOLARITY DIVIDE DIVIDE VALLEY

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

  13. When 3.0 moles of NaCl are dissolved in 1.0 L of H2O, what is the molarity? This box is empty – get it MT!  MT 3.0 mol NaCl = 3.0 M NaCl 1.0 L NaCl Don’t use H2O, switch to compound being dissolved

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

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

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

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

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

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

  20. 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

  21. 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

  22. 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

  23. 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

  24. 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

  25. 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

  26. Homework • Complete the 10 questions on the provided worksheet.

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