Standardisation of certified volumetric solution

hi, do we need standardisation of VWR 0.1M sodium hydroxide solution?
which is already get certificate of factor and actual molarity.

If its being used in quantitative calculations Yes. For qualitative (id) test No.

                           **0.1 M SODIUM HYDROXIDE SOLUTION** 

STANDARDIZATION :- TAKE 100 ML D.M. WATER AND ADD IN 0.5 ML OF PHENOLPHETHELIEN INDICATOR SOLUTION AND NUTERLIZED WITH 0.1 M SODIUM HYDROXIDE SOLUTION AND ADD ABOUT 200 MG OF POTASSIUM HYDROGEN PTHALATE AND SHAKE WELL AND TITRATE WITH 0.1 M SODIUM HYDROXIDE
0.1 X WT OF PHP X POTENCY OF PHP
------------------------------------------------------= MORALITY
20.42 X CONSUMED VOLUME X 100

= Molarity


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