Final answer:
Standardizing a solution of NaOH involves titrating an unknown concentration of stock solution to determine the titrant's concentration. NaOH solutions need to be standardized because their concentrations are not stable over time due to reactions with the air.
Step-by-step explanation:
Before using a solution of NaOH as titrant in a titration experiment, you should standardize the solution. Standardization is the process of titrating a solution prepared from an unknown concentration of stock solution to accurately determine the concentration of the titrant.
In particular, NaOH solutions need to be standardized because their concentrations are not stable over time due to the compounds reactions with the air.