# Molarity Calculator

Note
• Enter the values of the three known values
• Click on the calculate button.

Formula used
$\text{Molarity}=\frac {\text{mass}}{\text{Molar Mass} \times \text{Volume}}$

## What is Molarity

Molarity is one of the unit of measuring concentration of Solution. It is defined as the Number of moles of solute per litre of Solution. It is denoted by letter M
Molarity formula is given by
$\text{Molarity}=\frac {\text{mass}}{\text{Molar Mass} \times \text{Volume}}$
Where
mass -> Mass of the solute
Molar Mass -> Molar mass of the Solute
Volume -> Volume of the solution
Unit of Molarity is mol/L

Example of Few questions where you can use this Molarity Calculator
Question 1
What's the mass of NaCl required to make a 0.2mol/L 15ml NaCl solution in water? The molar mass of NaCl is 58.44276 g/mol.
Solution
Given , Molar Mass=58.44276 g/mol, Molarity = .2 mol/L, Volume = 15 ml = .015 Litre, Mass=?
Molarity formula is given by
$\text{Molarity}=\frac {\text{mass}}{\text{Molar Mass} \times \text{Volume}}$
Rearranging for Mass
$\text{mass}= \text{Molarity} \times \text{Molar Mass} \times \text{Volume}= .2 \times 58.44276 \times .015=0.1753 \ gm$
Question 2
What is the volume of a 0.1 M HCl solution containing 1.16 grams of HCl?. The molar mass of HCl is 36.5 g/mol.

Solution
Given , Molar Mass=36.5 g/mol, Molarity = 0.1 M, Volume = ?, Mass=1.16 grams
Molarity formula is given by
$\text{Molarity}=\frac {\text{mass}}{\text{Molar Mass} \times \text{Volume}}$
Rearranging for Volume
$\text{Volume}=\frac {\text{mass}}{\text{Molar Mass} \times \text{Molarity}}= \frac { 1.16}{36.5 \times .1} =.317 \ L$

Question 3
If 2 gm NaOH is dissolute in water to make solution upto 250 cc. Find the molarity of solution. Given Molar Mass of NaOH=40 g/mol
Solution
Given , Molar Mass=40 g/mol, Molarity =?, Volume = 250 cc= .250 L, Mass=2 grams
Molarity formula is given by
$\text{Molarity}=\frac {\text{mass}}{\text{Molar Mass} \times \text{Volume}}= \frac {2}{40 \times .250}=.2 \ M$

## How this Calculator works

• if mass, Molar Mass and volume is given ,then Molarity calculation done as below formula
$\text{Molarity}=\frac {\text{mass}}{\text{Molar Mass} \times \text{Volume}}$
• if mass, Molarity and volume is given ,then Molar Mass calculation is done as below formula
$\text{Molar Mass}=\frac {\text{mass}}{\text{Volume} \times \text{Molarity}}$
• if Mass, Molarity and Molar Mass is given ,then Volume calculation is done as below formula
$\text{Volume}=\frac {\text{mass}}{\text{Molar Mass} \times \text{Molarity}}$
• if Volume, Molarity and Molar Mass is given ,then mass calculation is done as below formula
$\text{mass}= \text{Molarity} \times \text{Molar Mass} \times \text{Volume}$