What is the Concentration of an Aqueous Solution?

Question:

An aqueous solution has a concentration of 1.23 x 10–5 M A. If we assume the density of the solution is 0.998 g/mL and the molar mass of A is 96.54 g/mol, what is the concentration of this solution?

Answer:

The concentration of the aqueous solution of 'A' is 1.23 x 10-5 M.

Explanation: The concentration of the aqueous solution you mentioned is given as 1.23 x 10–5 M. 'M' stands for molarity, which is a measure of the concentration of a solute in a solution in terms of moles per liter. So, the solution already has a molarity of 1.23 x 10–5, meaning there are 1.23 x 10-5 moles of 'A' per liter of the solution. The molar mass is 96.54 g/mol refers to the mass of one mole of 'A', however, in this particular case, the molar mass is not needed to determine the concentration as it is already given in moles per liter, which is a measure of concentration. So, the concentration of the aqueous solution of 'A' is 1.23 x 10-5 M.