Formic Acid Purity

AIM:

To determine the purity of given sample of formic acid.

APPARATUS:

• 50ml erlenmeyer flask
• Electronic balance
• 500ml beaker
• Burette
  

REQUIREMENTS:

• Formic acid sample
• Distilled water
• Phenolphthalein indicator
• 1N NaOH solution
  

PROCEDURE:

• Shake the given sample of formic acid.
• Transfer 20 ml to an erlenmeyer flask provided with a stopper.

• Transfer 1-2 gm of the sample to 300ml distilled water taken in a 500ml beaker containing 2 or 3 drops of phenolphthalein indicator.



• Note the weight taken.



• Titrate the contents in the beaker against 1N NaOH solution from the burette.

CALCULATION PART:
From the weight of sample taken, volume of NaOH & normality of NaOH , the purity of formic acid can be calculated.