How to calculate molarity from a solution’s concentration and volume?

Answer 1

Depending on how the concentration is stated, there are different ways to convert to molarity (M). For example if the concentration is given as grams / ml (g/ml), we would first convert the g to moles (using molar mass) and then convert ml to liters (L) by dividing my 1000. Finally, to obtain molarity, which is defined as moles of solute per liter of solution, we would simply divide the moles by the liters. Here is an example:

If a solution contains 0.10 g NaCl in 1.0 ml of solution, what is the molarity?

Molar mass of NaCl = 58 g / mole

Converting 0.1o g NaCl to moles, we have 0.1o g / 58 g/mol = 0.0017 moles

Converting 1.0 ml of solution to liters (L) we have 1.0 ml /1000 ml/L = 0.0010 L

Dividing moles by liters to get molarity (M) we have 0.0017 moles / 0.0010 L = 1.7 M

Answer 2

The concentration of a solution is, in other words, how much solute is in a solution. Molarity is one way to depict concentration, as it is the measure of moles of solute over liters of solution.

Molarity can be found with the equation M = mol/L, where liter is the volume!