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Solution Concentrations

Solution Concentrations. Percent by Mass (m/m). Mass of solute Mass of solution. ×100. Solution = solute + solvent. Example 1. An aquarium must contain 13.6 g N aCl per 100.0 g of water. What is the percent by mass (m/m) of NaCl in the solution?. Solute:13.6g (smaller #)

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Solution Concentrations

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  1. Solution Concentrations

  2. Percent by Mass (m/m) Mass of solute Mass of solution ×100 Solution = solute + solvent

  3. Example 1 An aquarium must contain 13.6 g NaCl per 100.0 g of water. What is the percent by mass (m/m) of NaCl in the solution? Solute:13.6g (smaller #) Solvent: 100.0g (larger #) Solution: 113.6g 13.6 113.6 ×100 = 11.97% ≈ 12.0% +

  4. Example 2 You have a 650.0g KCL solution. If the percent by mass is 1.25% (m/m), how many grams of solute is in the solution? How many grams of solvent are in the solution? Solution: 650.0g Solute: 8.13g Solvent = 641.87g ≈ 642g solute 650.0 ×100 = 1.25% − Solute = 8.13g

  5. Percent by Volume (v/v) Volume of solute Volume of solution ×100 Solution = solute + solvent

  6. Example 1 What is the percent by volume of ethanol in a solution that contains 45mL of ethanol dissolved in 145mL of water? Solute: 45mL (smaller #) Solvent: 145mL (larger #) Solution: 190mL 45 190 ×100 = 23.68% ≈ 24% +

  7. Means dissolved in water; water is the solvent Example 2 If you have 200.0 mL of a 35.0% aqueous solution of ethanol, what volume of ethanol and water are in the solution? Solution: 200.0mL Solute: 70.0mL Solvent = 130.0mL ≈ 130. or 1.3×102 mL solute 200.0 ×100 = 35.0% − Solute = 70.0mL

  8. Parts Per Million (ppm) Solute Solution ×106 1 ppm = 1mg/L

  9. Example 1 If 25 grams of a chemical is dissolved in 75 grams of water, what is the concentration of the chemical in parts per million (ppm)? Solute: 25g (smaller #) Solvent: 75g (larger #) Solution: 100g + 25 100 ×106 = 250,000 or 2.5×105 g

  10. Example 2 Suppose 17 grams of sucrose is dissolved in 183 grams of water. What is the concentration of sucrose in ppm? Solute: 17g (smaller #) Solvent: 183g (larger #) Solution: 200g + 17 200 ×106 = 85,000 or 8.5×104g

  11. Example 3 150 mL of an aqueous sodium chloride solution contains 0.0045g NaCl. Calculate the concentration of NaCl in parts per million (ppm). Remember 1ppm = 1 mg/L 0.0045g 1000mg 1000mL 150mL 1g 1L = 30 mg/L = 30 ppm

  12. Example 4 Convert 0.0035% NaCl by mass into parts per million of NaCl. * Think of 0.0035% like your grade on a test; 0.0035% means 0.0035 out of 100 0.0035 100 ×106 = 35ppm

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