A standard solution is the one whose concentration is known. When standardizing a solution, we use another standard solution, meaning we already know it's concentration in terms of grams per 1000cm3 or 1 liters. In the case of NaOH(sodium hydroxide) determine the amount of grams that are contained in 1000cm3 or 1liter.this concentration can be determined through balancing of an equation involving the NaOH and a standard solution of an acidic base like HCl (hydrochloric acid). The aim of standardizing the NaOH is to know the exact grams against volume contained in the solution. This unturn can be used to determine the concentration of another solution, which is not standard(of unknown moles ratio against volume)