Final answer:
The safe range for Q-San in parts per million (ppm) is 100 - 1000 ppm.
Step-by-step explanation:
The safe range in parts per million (ppm) for Q-San in a given context is 100 - 1000 ppm (c).
Parts per million is a unit used to measure small contributions. 1 ppm is equal to 0.0001%.
For example, if there are 1000 parts of Q-San in a million parts of the solution, the concentration would be 1000 ppm.