2. To make the correct volume of stock solution, which should you add first to a volumetric flask, the solid or water? Why?​

A stock or standard solution is a solution in which you accurately know its concentration. You can make stock solutions in the chemistry laboratory or buy from chemical manufacturers. Once you have a stock solution, you can prepare solutions of lower concentration by diluting the concentrated stock solution.

Explanation:

answer; economic order quantity;

it is the most commonly accepted one