Molarity which is otherwise known as molar concentration, is the number of moles of solute present per a unit volume of solution. It’s represented by the lowercase ‘c’.

Mathematically, c= n/v where ‘c’ is Molarity, ‘n’ is the amount of solute and ‘v’ is the volume of solution.

In the International System of Units (SI) the clear unit for molar concentration is mol/m3. However, this is inconvenient for most laboratory purposes and most chemical literature traditionally uses mol/dm³,

Molarity can be converted to Number concentration when multiplied with the Avogadro’s constant. Also to Mass concentration by multiplying it with the Molar mass of the constituents.

How to calculate Molarity

This outlines a straightforward method to calculate the molarity of a solution.

1. Find the number of moles of solute dissolved in solution,

2. Find the volume of solution in liters, and

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3. Divide moles solute by liters solution.

Note:

  • A solute – is the substance that is being dissolved such as sugar or mercury.
  • A solvent – refers to the liquid that the solute is being dissolved in.[contact-form][contact-field label=”Name” type=”name” required=”true” /][contact-field label=”Email” type=”email” required=”true” /][contact-field label=”Website” type=”url” /][contact-field label=”Message” type=”textarea” /][/contact-form]
  • A solution – refers to the mixture of the solvent and the solute so that solution equals solvent plus solute.

Examples

1. Calculate the molarity of a sugar solution if 4 liters of the solution contains 8 moles of sugar?

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a. 0.5 M
b. 8 M
c. 2 M
d. 80 M

Solution : Molarity = moles of solute/liters of solution = 8/4 = 2M

2. What is the molarity of a solution containing 5 moles of solute in 250 milliliters of solution?

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a. 20 M
b. 15 M
c. 0.104 M
d. 1.25 M

Solution: convert 250 ml to liters, 250/1000 = 0.25 then calculate molarity = 5 moles/ 0.25 liters = 20 M

In a case where you are given the Molarity and asked to get either the amount of solute or the volume of solution, you can do simple substitutions to attain that. The most important is that you should familiarize yourself with all the formulas.

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