The solubility is always stated as mass of solute per 100 gram of water.
What is solubility?
Solubility is defined as the maximum amount of solute that can dissolve in a known quantity of solvent at a certain temperature is its solubility.
In a solvent, a solution is a homogeneous mixture of one or more solutes. A typical example of a solution is sugar cubes introduced to a cup of tea or coffee. Solubility is the property that causes sugar molecules to dissolve. As a result, solubility can be described as a substance’s ability to dissolve in a given solvent.