The number of milligrams of KOH required to saponify 1 gm of fat is called

Options

A. Saponification number
B. Reichert Meissl number
C. Iodine value
D. Acetyl number

Answer

To solve the question, "The number of milligrams of KOH required to saponify 1 gm of fat is called," we need to identify the correct term from the options provided. Here’s the step-by-step solution:

### Step 1: Understand the Concept of Saponification
Saponification is a chemical reaction that occurs when a fat or oil reacts with an alkali, such as potassium hydroxide (KOH), to produce soap and glycerol. The amount of KOH required to saponify a specific amount of fat is a measure of the fat's characteristics.

**Hint:** Remember that saponification involves fats reacting with an alkali to form soap.

### Step 2: Identify the Relevant Term
The question specifically asks for the term that describes the number of milligrams of KOH needed to saponify 1 gram of fat. This term is known as the "saponification number" or "saponification value."

**Hint:** Look for terms that relate to the measurement of fat and alkali interaction.

### Step 3: Analyze the Other Options
1. **Ripartmysal Number**: This term is related to the volatile acid content of fats, not the saponification process.
2. **Iodine Value**: This measures the degree of unsaturation in fats and oils, not the amount of KOH needed for saponification.
3. **Acetyl Number**: This measures the amount of free hydroxyl groups in fats or oils, not the saponification process.

**Hint:** Eliminate options that do not directly relate to the saponification process.

### Step 4: Conclusion
Based on the definitions and explanations, the correct answer is the "saponification number." This number indicates how much KOH is required to saponify 1 gram of fat.

**Final Answer:** The number of milligrams of KOH required to saponify 1 gm of fat is called the **saponification number**.

---