Concentration of Solute

Date:  November 5th, 2012
Homework:  Molarity Worksheet

On Monday, we learned how to determine the amount of solute in a solution by using it's concentration. One of the ways to measure concentration is molarity, which is modeled by the following equation:

Molarity (M) = moles of solute
                       liters of solution

You can find any one of these variables with simple algebra if you know the two others:

6 = mol solute
           .25

.25 x 6  = .25 x mol solute

mol solute = 1.5



The two other ways to measure concentration are molality and % mass :

Molality (m) = mol solute
                  kilograms solvent

% mass = grams solute
               grams solution


Molarity can be used to calculate the dilutions of substances by the equation:

M₁V₁=M₂V₂

M₁ and V₁ are the initial molarity and volume of the solution. M₂ and V₂ are the molarity and volume after the dilution.