Determination of Total Fatty Matter (TFM) of Bathing Soap

AIM :

To determine the TFM of bathing soap. Here i used the Medimix soap.

PRINCIPLE:

TFM is determined by titrating fatty acids by means of HCl & extracting oil & acid with ether.

APPARATUS:

• 2 separating funnels


• 250ml beaker :1


• 100ml conical flask :1


• Electronic balance
• Air oven

REQUIREMENTS:

• Hot water
  
• 1:1 HCl


• ether


• soap sample

PROCEDURE:

• The bathing soap is made into small slices.
  Weigh 5gm of thoroughly mixed soap sample using an electronic balance.



• Note the weight taken.



• Add the weighed soap sample into a separating funnel.
  
  

• Add 30ml hot water from a beaker & mix well.


• Excess 1:1 HCl is added to decompose the soap, till acids float as a clear layer on the top, cool & add 50ml ether, mix well & separate.


• The aqueous layer is taken in another separating funnel & extract with ether.


• The combined ether extract were washed thrice with water to remove mineral acids & the contents were collected in a previously weighed 100ml conical flask.

Distill off ether from the conical flask & dry the conical flask ( with the contents) in a hot air oven to constant weight.

CALCULATION:

From the weight of soap taken, weight of conical flask alone & the weight of conical flask with the contents, the total fatty matter can be calculated. I was able to calculate the TFM of MEDIMIX soap as 57.98