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
