For an experiment, you are required to prepare a series of three solutions by diluting a cobalt(II) chloride stock solution. After making each solution, you notice that each is a different shade of pink. Which is the most concentrated? a. the lightest pink solution you prepared
b. the darkest pink solution you prepared
c. the medium pink solution you prepared
d. the stock solution

The stock solution

Explanation:

When preparing a series of solutions from a stock solution, the stock solution will always be the most concentrated solution of the set. Each of the subsequent solutions are prepared by dilution, which entails adding solvent to a portion of the stock solution. This will always result in a solution that is less concentrated than the stock solution.

they both have a y in them