Final answer:
The proper concentration range for Kay-5 is not provided in the information, and cannot be accurately determined without further context. The concept relates to college-level chemistry, dealing with molarity and equilibrium concentrations.
Step-by-step explanation:
The proper concentration range for Kay-5 is not specified in the given information, hence it is not possible to provide a definitive answer to the question regarding Kay-5 concentration ranges. However, the additional provided information discusses various chemical concepts and calculations related to molarity, ionization, and equilibrium concentrations which fall within the realm of college-level chemistry. Concentration units such as molarity (M) play a crucial role in these calculations, implying relations between the concentration of substances and their respective ionization or dissociation within a solution.