Question

Explain the difference between density and molarity, and how each is used in laboratory calculations for hydrochloric acid (HCl) and water

Answer 1

Solution :-

Density is defined as the mass per unit volume

so the formula to calculate the density is

density = mass of substance / volume of substance

molarity is the concnetration unit which is moles of solute present in per liter of the solution

so the formula for the molarity = moles / liter of solution

The volume is the temperature dependent property therefore the change in the temperature can change the volume so the molarity can be changed.

but the mass does not changes with temperature so we can calculate the volume of the solution using the density and mass of the solution and then we can use the volume to calculate the molarity of the solution.