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Published byCory Cook Modified over 8 years ago

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M OLARITY Solutions

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M OLARITY (M) Is the number of moles of solute dissolved per Liter of solution. Also know as molar concentration. Unit M is read as molar To calculate a solution’s molarity, you must know the volume of the solution and the amount of dissolved solute Molarity (M) = moles of solute liters of solution

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E XAMPLE A 100.5 mL intravenous (IV) solution contains 5.10 g of glucose (C 6 H 12 O 6 ). What is the molarity of this solution? The molar mass of glucose is 180.16 g/mol. Given: mass of solute= 5.10 g of glucose Molar mass of glucose= 180.16 g/mol Volume of solution = 100.5 mL Unknown: Concentration = ?M

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S TEPS TO SOLVE THE EXAMPLE 1.) Use the molar mass to calculate moles of glucose 5.10 g C 6 H 12 O 6 1 mole C 6 H 12 O 6 180.16 g C 6 H 12 O 6 2.) Convert mL to Liters 100.5 mL of solution 1 L 1,000 mL 3.) Plug in values into the formula for molarit Molartiy = moles of solute Molarity = Liters of solution = 0.0283 C 6 H 12 O 6 = 0.1005 L of solution = 0.282 M 0.0283 mol C 6 H 12 O 6 0.1005 L of solution

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