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Q. For standardizing NaOH solution, which of the following is used as a primary standard ?

JEE MainJEE Main 2018Redox Reactions

Solution:

The solution that can be prepared directly by dissolving an accurately weighed amount of the substance in water and making up the volume to a known amount by water is known as primary standard solution. Oxalic acid is an example of primary standard while $NaOH$ is a secondary standard solution. Hence, strength of $NaOH$ solution can be determined by titrating against oxalic acid. This process is known as standardisation.