Solutions Molarity 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 solutions molarity you must know the volume of the solution and the amount of dissolved solute ID: 345471
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Slide1
Molarity
SolutionsSlide2
Molarity (M)
Is the number of moles of solute dissolved
per
Liter of solution. Also know as molar concentration. Unit M is read as molarTo calculate a solution’s molarity, you must know the volume of the solution and the amount of dissolved soluteMolarity (M) = moles of solute liters of solutionSlide3
Example
A 100.5 mL intravenous (IV) solution contains 5.10 g of glucose (C
6
H12O6). 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 glucoseMolar mass of glucose= 180.16 g/molVolume of solution = 100.5 mLUnknown:
Concentration = ?MSlide4
Steps to solve the example
1.) Use the molar mass to calculate moles of glucose
5.10 g
C6H12O6 1 mole C6H12O6
180.16 g C
6
H
12
O62.) Convert mL to Liters100.5 mL of solution 1 L 1,000 mL3.) Plug in values into the formula for molaritMolartiy = 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 C6H12O6
0.1005 L of solution