# What is the molarity of a phosphoric acid solution if the solution is 85% by mass H3PO4 and has a...

## Question:

What is the molarity of a phosphoric acid solution if the solution is 85% by mass {eq}H_3PO_4 {/eq} and has a density of 1.7 g/mL?

## Solution Concentrations:

The moles of solute present in any solution can be expressed by the concentration units of molarity and molality. The molarity and molality are concentration units that are commonly used. Both are by moles of solute. However, we can also express the amount in moles of solute by using the mole fraction. These solution concentration units can be determined by using the equation below.

{eq}\rm Molarity = \dfrac{moles~solute}{liters~solution} \\ molality = \dfrac{moles~solute}{kg~solvent} \\ mole~fraction = \dfrac{moles~component}{total~moles~of~solution} {/eq}