Molarity
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Key Questions

Answer:
Molarity is the concentration of a solution expressed as the number of moles of solute per litre of solution.
Explanation:
To get the molarity, you divide the moles of solute by the litres of solution.
#"Molarity" = "moles of solute"/"litres of solution"# For example, a 0.25 mol/L NaOH solution contains 0.25 mol of sodium hydroxide in every litre of solution.
To calculate the molarity of a solution, you need to know the number of moles of solute and the total volume of the solution.
To calculate molarity:
 Calculate the number of moles of solute present.
 Calculate the number of litres of solution present.
 Divide the number of moles of solute by the number of litres of solution.
EXAMPLE:
What is the molarity of a solution prepared by dissolving 15.0 g of NaOH in enough water to make a total of 225 mL of solution?
Solution:
1 mol of NaOH has a mass of 40.00 g, so
#"Moles of NaOH" = 15.0 cancel("g NaOH") Ã— "1 mol NaOH"/(40.00 cancel("g NaOH")) = "0.375 mol NaOH"# #"Litres of solution" = 225 cancel("mL soln") Ã— "1 L soln"/(1000 cancel("mL soln")) = "0.225 L soln"# #"Molarity" = "moles of solute"/"litres of solution" = "0.375 mol"/"0.225 L" = "1.67 mol/L"# Some students prefer to use a "molarity triangle".
It summarizes the molarity formulas as
#"Moles" = "molarity Ã— litres"# #"Molarity" = "moles"/"litres"# #"Litres" = "moles"/"molarity"# 
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Solutions

1Solutions

2Solution Formation

3Solvation and Dissociation

4Saturated and Supersaturated Solutions

5Measuring Concentration

6Molarity

7Molality

8Percent Concentration

9Dilution Calculations

10Factors Affecting Solubility

11Solubility Graphs

12Colligative Properties

13Separating Mixtures

14Osmolarity

15Solute

16Solvent

17Solving Using PPM (Parts Per Million)