How can I find percent concentration from density?
This is usually part of a problem that asks you to convert from one set of concentration units to another.
Here's a typical problem.
What is the percent concentration of a 13.0 mol/L solution of phosphoric acid that has a density of 1.464 g/mL?
1, Assume some fixed volume of the solution.
For convenience, let's assume a volume of 1 L.
2. Calculate the mass of H₃PO₄.
1 L soln ×
3. Use the density to calculate the mass of the solution.
1000 mL soln ×
4. Calculate the percent concentration
% by mass =
The solution is 87.0 % H₃PO₄ by mass.