4 Ways to Express Concentrations in Solutions

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Name:___________________________ Per:_________ 4 Ways to Express Concentrations in Solutions If you were drinking Kool-Aid you might describe the solution as dilute or concentrated as a means to express concentration. Concentration = amount solute (part) amount solvent (whole) Chemists can express concentrations in various ways including: Molarity (M), Parts per million (ppm), % composition, or gram/Liter (g/L). Each one describes this ratio using slightly different methods of measuring the amount of solute or the amount of solvent. Important information to remember: mass 1 mL H2O = 1 gram 1 L solution = 1000 mL Calculate the concentration for each solution using 4 ways shown (show work): NaCl (aq) C12H22O11 (aq) (2g NaCl / 100 g H2O) (2g C12H22O11 / 100 g H2O) 1. % Composition = 2. Parts Per Million (ppm) = 3. Grams per Liter (g/L)= 4. Molarity (M) = *Most commonly used in chemistry* Calculations involving Concentrations (Show formula, show work & box answers) Percent Composition 1. What is the percent composition of a solution in which 480 grams of sodium chloride, NaCl, is dissolved in 4 liters of solution. 2. A solution of sugar contains 35 grams of sucrose, C12H22O11 in 100 mL of water. What is the percent composition of the solution? Grams/Liter 3. A solution of sugar contains 35 grams of sucrose, C12H22O11 in 100 mL of solution. What is the concentration of the solution in grams/Liter? 4. A solution of sodium hydroxide, NaOH, contains 0.3 moles of solute in 4 liters of solution. What is the concentration of the solution in grams/Liter? Parts per million 5. What is concentration, in parts per million (ppm), of a solution in which 80 grams of sodium hydroxide, NaOH, is dissolved in 1 liter of solution? 6. What is concentration, in parts per million, of a solution in which 50 grams of aluminum oxide, Al2O3, is dissolved in 500 mL of solution? Molarity 7. 45 grams of glucose, C6H12O6 is dissolved in enough water to make 0.500 liters of solution 8. 116 grams of KF is dissolved in enough water to make 4 L of solution Application: 1. What are 2 different things you can do to make this solution more concentrated. 2. A .01M solution of HCl will not hurt your skin, yet a .1M solution of HCl will leave a painful sore. Explain. 3. How is it possible to die from drinking too much water in a very short amount of time (water intoxication)? .

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