Molarity Practice Questions
How to Solve Molarity Questions
Molarity is also called, amount-of-substance concentration, amount concentration, substance concentration, or simply concentration.
The Molarity of a solution simply means the amount of moles contained in every liter of a solution. To better understand the concept of molarity of a solution it is necessary to first understand some related terms.
* 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.
* A solution – refers to the mixture of the solvent and the solute so that solution equals solvent plus solute.
The Molarity of the solution is thus a measurement of the molar concentration of the solute in the solution. The molarity of a solution is measured in moles of solute per liter of solution, or mol/liter. For example, if the molarity of a mercury solution is 1M, it simply means that there is 1 mole of sugar contained in every 1 liter of the solution.
The formula for molarity is = moles of solute/total liters of solution
Here is a typical question:
If 2 moles of salt is dissolved to form 1 liter of solution, calculate the molarity of the solution.
a. 1 M solution
b. 1.5 M solution
c. 2 M solution
d. 2.5 M solution
The formula for calculating molarity when the moles of the solute and liters of the solution are given is = moles of solute/ liters of solution.
Moles of Solute = 2 moles of sugar
Solution liters = 1 liters
The molarity of the solution = 2 moles of solvent/1 liters of solution = 2 M solution.