The boiling of fat and aqueous caustic soda is referred to as

Analysis

The question asks for the specific name of the chemical reaction that occurs when fat (a triglyceride) is heated with aqueous caustic soda (sodium hydroxide, NaOH).

Concept Explanation

This process is a classic reaction in organic chemistry involving esters.

• Fats and Oils: These are naturally occurring esters formed from glycerol (a trihydric alcohol) and long-chain fatty acids.
• Caustic Soda (NaOH): This is a strong base.
• The Reaction: When an ester is heated with an alkali (base), the ester bond is broken. The fatty acid part reacts with the sodium from the base to form a sodium salt of a fatty acid, which is commonly known as soap. The glycerol is also released as a byproduct.

This reaction is the fundamental process used in the commercial and domestic production of soap.

Step-by-Step Solution

1. Identify the reactants: Fat (ester) + NaOH (alkali).
2. Identify the products: Soap (sodium salt of fatty acid) + Glycerol.
3. Define the terms: • Hydrolysis: A general term for breaking down a compound using water. • Esterification: The reverse process; making an ester from an alcohol and an acid. • Acidification: The process of making a solution acidic. • Saponification: Specifically refers to the alkaline hydrolysis of fats or oils to produce soap.

Since the reaction specifically produces soap from fat and caustic soda, the term "saponification" (from the Latin sapo, meaning soap) is the correct technical term.

Conclusion

The process of boiling fat with aqueous caustic soda to produce soap is known as saponification.

Exam Tip: Remember the mnemonic "Saponification = Soap-making." Whenever you see "fat/oil" + "alkali" (like NaOH or KOH), always look for "saponification" in your options.