Standardisation of certified volumetric solution

Quality Control
1

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

2

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

3 
                           **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

4

= Molarity