Percentage Purity of NaOH (Sodium Hydroxide)

 

Process:

ð  Weigh 2 gm of the sample accurately in weighing bottle.

ð  Transferred the same sample in a 500 ml. volumetric flask.

ð  Made the solution up to 500 ml. with distilled water.

ð  Pipette out 10 ml. from the same solution using volumetric pipette and transferred into a conical flask.

ð  Add 2 – 3 drops of phenolphthalein indicator.

ð  Titrate it against 0.1(1/10)N HCl (Hydrochloric acid).

 Chemical Reaction:

NaOH_(aq) + HCl_(aq) à NaCl_(aq) + H₂O_(aq)

Calculation:

Answer: % Purity of NaOH is (BR) X 10