Chemistry - Concentration Terms Question with Solution | TestHub

When a solute is present in very minute amounts (trace quantities), the concentration is expressed in ppm. $$\begin{array}{rl}& \text{ ppm of }A=\frac{\text{ mass of component }A}{\text{ total mass of solution }}\times 10^6\\ & =\frac{0.025}{10^3}\times 10^6=25\mathrm{ppm}\text{. }\\ & \end{array}$$