Question

8) 0.450 moles of NaCl are dissolved in 145.0 mL of water. Calculate the molarity of the NaCl solution.

Answer 1

Molarity is a way of expressing the concentration of a solute in a solution, it is expressed with the term M and can be described by the following equation:

`Molarity=(MolesSolute)/(Lsolution)`

Moles of solute = 0.450 mol

Lsolution= Liters of water+Liters of NaCl

We will assume in this case that the volume of NaCl is negligible compared to the volume of water. Therefore, the volume of the solution will be 145.0 mL or 0.1450L

We replace the known data:

`Molarity=(0.450mol)/(0.1450L)=3.1M`

Answer: The molarity of the NaCl solution is 3.1M