M OLARITY Solutions

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

E XAMPLE A 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 g/mol. Given: mass of solute= 5.10 g of glucose Molar mass of glucose= g/mol Volume of solution = mL Unknown: Concentration = ?M

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 g C 6 H 12 O 6 2.) Convert mL to Liters 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 = C 6 H 12 O 6 = L of solution = M mol C 6 H 12 O L of solution