A stock solution is made by dissolving the desired amount of. In chemistry a primary standard is a reagent that is very pure representative of the number of moles the substance contains and easily weighed. Standard Solution Easy Science Physics Concepts Learn Physics Easy Science Standard solutions are solutions that have a defined and correct quantity of the material or product ie. . A reagent which is pure stable non-hydroscopic has relatively high molecular mass. Standard reagent or standard solution are of two types. Ad Browse Discover Thousands of Science Book Titles for Less. Standard solutions are solutions with a known concentration of a substance. A reagent is a chemical used to. They are used in titrations in order to measure the unknown concentration of a material. A standard solution is any chemical solution thats been prepared from a primary standard and where you know the concentrations. What