The reason for the standardization of sodium hydroxide is that the compound is deliquescent.
The term standardization has to do with the process by which the concentration of the sodium hydroxide is determined. We know that there are some compounds that we do not need to standardize before they are used. The solid is just dissolved and made up to mark and then the solution thus prepared could be used in the standardization of other solutions.
However, this is not the case for sodium hydroxide because the compound in itself is deliquescent. This means that the solid is able to absorb moisture hence we can not get the actual amount of the sodium hydroxide by merely weighing the solid.
As such, we can be able to obtain the concentration of the sodium hydroxide by standardizing it using a primary standard.
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