# What is a standard solution?

Mar 4, 2017

They may be primary standards - i.e.: solutions of salts that can be obtained in extremely high purity, such as $N a C l$, ${K}_{2} C r {O}_{7}$, $C a C {O}_{3}$ or $N {a}_{2} {H}_{2} {Y}_{2}$ (EDTA) - or secondary standards - solutions that were analyzed using a primary standard.