Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 9 Answered

Preparation of Soap in a lab.
Asked by Tejkalyani | 18 Jun, 2008, 06:30: PM
answered-by-expert Expert Answer

Soap is produced in lab by sponification process.Saponification is commonly used to refer to the reaction of a metallic alkali (base) with a fat or oil to form soap. Saponifiable substances are those that can be converted into soap.

CH2-OOC-R - CH-OOC-R - CH2-OOC-R (fat) + 3 NaOH ( or KOH)

both heated →

CH2-OH -CH-OH - CH2-OH (glycerol) + 3 R-CO2-Na (soap)
where R=(CH2)14CH3 in the example (right)

Sodium hydroxide (NaOH) is a caustic base. If NaOH is used a hard soap is formed, whereas when potassium hydroxide (KOH) is used, a soft soap is formed. Vegetable oils and animal fats are fatty esters in the form of triglycerides. The alkali breaks the ester bond and releases the fatty acid and glycerol. If necessary, soaps may be precipitated by salting it out with saturated sodium

Answered by | 21 Jun, 2008, 05:24: PM
CBSE 9 - Chemistry
Asked by mailtoparvathyprajith | 12 Feb, 2024, 10:08: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by rajputanaji290 | 03 Oct, 2023, 09:30: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by Premkharra7568 | 18 Aug, 2023, 04:41: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by rubinapathan228 | 29 Jun, 2023, 05:45: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by shanuk98703 | 12 Apr, 2023, 09:32: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by yforyt3672 | 09 Apr, 2023, 07:37: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by shivalaxmi0205 | 08 Mar, 2023, 07:47: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by shivalaxmi0205 | 08 Mar, 2023, 07:46: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by shivalaxmi0205 | 08 Mar, 2023, 07:43: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
Get Latest Study Material for Academic year 24-25 Click here
×