In analytical chemistry, a standard solution is a solution containing a precisely known concentration of an element or a substance. A known mass of solute is dissolved to make a specific volume. ... A primary standard is a reagent that is extremely pure, stable, has no waters of hydration, and has high molecular weight.

Are standard solution primary standard solution or not?

A solution of accurately known concentration is known as a standard solution. A standard solution can be prepared directly from a primary standard. A primary standard must have, at least, the following characteristics: high state of purity, stability in air and in solution, solubility, reasonably high formula mass.

Why are standard solutions used as primary standards?

Primary standards are typically used in titration to determine an unknown concentration and in other analytical chemistry techniques. ... The reaction confirms that the solution is at a specific concentration. Primary standards are often used to make standard solutions, solutions with a precisely known concentration.