When a solute is present in trace quantities then which of the following expression is used?
Answer & explanation
Correct answer: option 4
Parts per million: When a solute is present in trace quantities, it is convenient to express concentration in parts per million (ppm) and is defined as:
Parts per million = \(\frac{\text{Number of parts of the component}}{\text{Total number of parts of all components of the solution}}\) x 106