Introduction
A solution is made up of two components; solute and solvent. The concentration of a solution depends on the amount of solute and solvent added to the solution. Molarity is a unit of concentration of a solution. It is the amount of solute per liter of solvent. A molarity calculator is used to calculate the molarity of a solution quickly. Our molarity calculator is free and easy to use.
What is Molarity?
Concentration can be defined as how much substance is dissolved in a solvent. The more solute there is per amount of solvent, the more concentrated the solution gets. Molarity is one way of expressing concentration.
It is the number of moles of solute present in one liter of solution. A solvent is a substance that dissolves the solute and solute is the substance that gets dissolved. A solvent is usually used in large amounts and solute is taken in small quantities. Molarity is expressed in moles per liter (mol / L) and is denoted by “M”.
Example:
Suppose we have a 1.25M KCl solution then it means there are 1.25 moles of KCl dissolved for every 1 liter of solution or 1.25 moles per Liter. We can also say it is a “1.25 Molar solution of KCl” or “the molarity f the solution is 1.25M”.
How to Calculate the Molarity of a given Solution?
The following formula is used to calculate the molarity of a given solution manually
$$Molarity\;=\;\frac{No.\;of\;moles\;of\;solute}{total\;volume\;of\;solution}$$
If the mass of solute is given in grams then first you convert the given mass to the number of moles and then carry out the calculation. Or you can simply use our molarity calculator to save time and energy.
$$Moles\;=\;\frac{mass}{molar\;mass}$$
Problem 1
Calculate the molarity of 0.65 mol NaF dissolved in a total volume of 0.50 liters.
Formula
Molarity = no. of moles of solute / Volume of solution
Molarity = 0.65 / 0.50
Molarity = 1.3 mol / L
Answer; the molarity of the above solution is 1.3 mol / L.
Problem 2
What would be the molarity of 25.2 grams of NaCl dissolved in a total volume of 0.75 liters?
Formula
Molarity = no. of moles of solute / Volume of solution
Moles of solute = mass of solute / molar mass of solute
Moles of solute = 25.2 / 58.44
Moles of solute = 0.43 moles
Molarity = 0.43 / 0.75
Molarity = 0.5 mol / L
Answer; the given solution of NaCl is 0.5 Molar.
FAQ's
What is the Difference Between Molality and Molarity?
Molality is the number of moles of solute per kg of solvent while Molarity is the no. of moles of solute per liter of solution.
How many Moles of KBr are Required to Prepare a 2M Solution?
2 moles of KBr are required to prepare a 2 Molar solution.
Molarity = moles / Volume
2 = moles / 1L
Moles = 2 x 1
Moles = 2
