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Chapter 8 Solution

Chapter 8 Solution. Percent Concentration. Percent Concentration. Describes the amount of solute dissolved in 100 parts of solution amount of solute 100 parts solution. Mass-Mass % Concentration. mass/mass % = g solute x 100% 100 g solution.

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Chapter 8 Solution

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  1. Chapter 8Solution Percent Concentration LecturePLUS Timberlake

  2. Percent Concentration Describes the amount of solute dissolved in 100 parts of solution amount of solute 100 parts solution LecturePLUS Timberlake

  3. Mass-Mass % Concentration mass/mass % = g solute x 100% 100 g solution LecturePLUS Timberlake

  4. Mixing Solute and Solvent Solute + Solvent 4.0 g KCl 46.0 g H2O 50.0 g KCl solution LecturePLUS Timberlake

  5. Calculating Mass-Mass % g of KCl = 4.0 g g of solvent = 46.0 g g of solution = 50.0 g %(m/m) = 4.0 g KCl (solute) x 100 = 8.0% KCl 50.0 g KCl solution LecturePLUS Timberlake

  6. Learning Check PC1 A solution contains 15 g Na2CO3 and 235 g of H2O? What is the mass % of the solution? 1) 15% (m/m) Na2CO3 2) 6.4% (m/m) Na2CO3 3) 6.0% (m/m) Na2CO3 LecturePLUS Timberlake

  7. Solution PC1 mass solute = 15 g Na2CO3 mass solution = 15 g + 235 g = 250 g %(m/m) = 15 g Na2CO3 x 100 250 g solution = 6.0% Na2CO3 solution LecturePLUS Timberlake

  8. Mass-Volume % mass/volume % = g solute x 100% 100 mL solution LecturePLUS Timberlake

  9. Learning Check PC2 An IV solution is prepared by dissolving 25 g glucose (C6H12O6) in water to make 500. mL solution. What is the percent (m/v) of the glucose in the IV solution?1) 5.0% 2) 20.% 3) 50.% LecturePLUS Timberlake

  10. Solution PC2 1) 5.0% %(m/v) = 25 g glucose x 100 500. mL solution = 5.0 %(m/v) glucose solution LecturePLUS Timberlake

  11. Writing Factors from % • A physiological saline solution is a 0.85% (m/v) NaCl solution. • Two conversion factors can be written for the % value. 0.85 g NaCl and 100 mL NaCl soln 100 mL NaCl soln 0.85 g NaCl LecturePLUS Timberlake

  12. % (m/m) Factors Write the conversion factors for a 10 %(m/m) NaOH solution NaOH and NaOH soln NaOH soln NaOH LecturePLUS Timberlake

  13. % (m/m) Factors Write the conversion factors for a 10 %(m/m) NaOH solution NaOH and NaOH soln NaOH soln NaOH 10 g 100 g 100 g 10 g LecturePLUS Timberlake

  14. Learning Check PC 3 Write two conversion factors for each of the following solutions: A. 8 %(m/v) NaOH B. 12 %(v/v) ethyl alcohol LecturePLUS Timberlake

  15. Solution PC 3 Write conversion factors for the following: A. 8 %(m/v) NaOH 8 g NaOH and 100 mL 100 mL 8 g NaOH B. 12 %(v/v) ethyl alcohol 12 mL alcohol and 100 mL 100 mL 12 mL alcohol LecturePLUS Timberlake

  16. Using % Factors How many grams of NaCl are needed to prepare 250 g of a 10.0% (m/m) NaCl solution? Complete data: ____________ g solution ____________% or (______/_100 g_) solution ____________ g solute LecturePLUS Timberlake

  17. Clculation Using % Factors 250 g solution 10.0% or (10.0 g/100 g) solution ? g solute 250 g NaCl soln x 10.0 g NaCl = 25 g NaCl 100 g NaCl soln LecturePLUS Timberlake

  18. Learning Check PC4 How many grams of NaOH do you need to measure out to prepare 2.0 L of a 12%(m/v) NaOH solution? 1) 24 g NaOH 2) 240 g NaOH 3) 2400 g NaOH LecturePLUS Timberlake

  19. Solution PC4 2.0 L soln x 1000 mL = 2000 mL soln 1 L 12 % (m/v) NaOH = 12 g NaOH 100 mL NaOH soln 2000 mL x 12 g NaOH = 240 g NaOH 100 mL NaOH soln LecturePLUS Timberlake

  20. Learning Check PC5 How many milliliters of 5 % (m/v) glucose solution are given if a patient receives 150 g of glucose? 1) 30 mL 2) 3000 mL 3) 7500 mL LecturePLUS Timberlake

  21. Solution PC5 5% m/v factor 150 g glucose x 100 mL = 3000 mL 5 g glucose LecturePLUS Timberlake

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