Question

What is meant by the mass/mass percent concentration of a solution?

Answer 1

The concentration of a chemical substance can be expressed in different terms like molarity, molality, normality, mole fraction and mass percent. Mass percent is used to express the concentration of solution when the mass of solute and mass of solution were given.

Complete Step By Step Answer:
Solution is a homogeneous mixture of a solute and solvent. The solute dissolves in solvent to make a solution. Solute will be in less quantity and the solvent will be in high quantity in the solution.
Concentration tells about the amount of solute dissolved in the solution. It can be expressed in different ways. One of them is mass percent. Mass percent can be used to express the concentration of solution. When the mass of solute and mass of solution were known, the mass percent can be known.
The formula for the mass percent can be written as follows:
Mass percent is equal to the ratio of mass of solute and mass of solution multiplied with $100$
${w_i} = \dfrac{{{m_i}}}{{{m_{total}}}} \times 100$
Where ${w_i}$ is mass percent
${m_i}$ is mass of solute
${m_{total}}$ is mass of solution
The mass of solution is equal to the sum of the mass of solute and mass of the solvent.

Note:
The mass percent of the element in the compound can also be expressed in terms of mass percent. To calculate this, the mass of the element and the mass of the compound should be known. The ratio should be taken and has to be multiplied with $100$ gives the mass percent of the element.