Molarity actually tells us that what concentration of a solute is present in any solution. If we look at the formula of molarity, it can be defined as the number of moles of solute that are present per liter of the total solution. If we recall our primary lessons of chemistry, then we come to know that solute is any substance which is dissolved in a solvent and the combination of solute plus solvent is referred to as a solution. If we go for the calculation of molarity of a solution of copper sulfate Pentahydrate, then it will involve simply the same procedure which is being employed in calculating the molarity of other solutions i.e. dividing the moles of copper sulfate Pentahydrate with the volume of solution of copper sulfate Pentahydrate.
Things those are required for calculating the molarity of copper sulfate Pentahydrate include:
- Weighing balance.
- Copper sulfate Pentahydrate
Steps for calculating the molarity of Copper sulfate Pentahydrate:
- The mass of copper sulfate Pentahydrate that needs to be dissolved in the solution is measured and recorded by the help of weighing balance.
- By the use of molar mass of copper sulfate Pentahydrate, its mass is converted into the number of moles. As we know that the molar mass of copper sulfate Pentahydrate is found to be 249.70 g/mol, so for converting it into number of moles, the formula is:
Number of moles of copper sulfate Pentahydrate = Number of gram x (1 mol / 249.70 g)
For suppose, if we say that 25 grams of copper sulfate Pentahydrate are equivalent to the 0.1 moles of copper sulfate Pentahydrate, then the calculation is given as:
(25 grams x (1 mol / 249.70 grams) = 0.1 mol)
- Copper sulfate Pentahydrate is dissolved in a volumetric flask by taking water as solvent in order to make the final solution of desired volume. Final volume of the solution is measured in the units of liters.
- Number of moles of copper sulfate Pentahydrate are divided by the total volume os its solution in liters. For suppose, 25 grams is the amount of copper sulfate Pentahydrate which is collected for making the final solution of 1 liter, in this case molarity will be equivalent to 0.1 M as shown in the following step:
(0.1 moles /1 Liter = 0.1 M)
If final solution is not made up to 1 liter, suppose the same amount of the solute i.e. copper sulfate Pentahydrate is taken but here the volume of final solution is changed i.e. it will make a solution of 2 liters then the molarity will fall to half as illustrated in the following step:
(0.1 moles / 2 Liters = 0.05 M)
Instructions & caution:
- Molarity is totally different from normality and molality. So the practitioner should not get confuse in these terms.
- Mass of solute should accurately be measured. Otherwise it can produce a direct impact in the resulting then can give wrong reproducible results or a false-positive result.
Here’s an Easy to use Molarity Calculator for you to calculate molarity online!