皂化反应制皂

用氢氧化钠将油脂转化为肥皂

Organic Synthesis Intermediate (High School) 60 分钟 ~$10.00

目标

通过植物油与氢氧化钠的皂化反应制造肥皂，演示甘油三酯中酯键的水解。

背景

Saponification is the base-catalyzed hydrolysis of a fat or oil (triglyceride) to produce glycerol and soap (sodium salts of fatty acids). This ancient chemical reaction is the basis of all soap manufacturing and demonstrates ester bond cleavage.

安全警告

  • Concentrated NaOH is extremely corrosive
  • Wear nitrile gloves and goggles at all times
  • Hot oil and NaOH can cause severe burns
  • Do not use the soap on skin until it has fully cured (4-6 weeks)

所需PPE

goggles gloves lab_coat

材料

  • Vegetable oil (olive or coconut) (20 mL)
  • Sodium hydroxide (NaOH) (10 mL)
    6M solution
  • Ethanol (10 mL)
    To help mix oil and base
  • Sodium chloride (NaCl) (15 g)
    Saturated solution for salting out
  • Distilled water (100 mL)

设备

250 mL beaker Hot plate Glass stirring rod Cheesecloth or filter Mold (small cup)

步骤

1

Heat 20 mL of vegetable oil in the beaker to about 40°C on the hot plate.

3 分钟
2

Mix 10 mL of 6M NaOH with 10 mL ethanol in a separate container.

2 分钟 NaOH is corrosive
3

Slowly add the NaOH/ethanol mixture to the warm oil while stirring continuously.

3 分钟 Hot caustic mixture
4

Continue heating and stirring at 60-70°C for 20 minutes until the mixture becomes thick and opaque (trace).

20 分钟
5

Add 50 mL of saturated NaCl solution to salt out the soap. Stir and allow to cool.

10 分钟
6

Filter the solid soap through cheesecloth. Press out excess liquid.

5 分钟
7

Mold the soap into a shape and allow to dry for 24 hours.

3 分钟 Do not use on skin until fully cured
8

Test a small piece by dissolving in warm water — it should produce lather.

3 分钟

预期结果

A solid, white to cream-colored soap that lathers when dissolved in water. The soap may feel slightly slippery, indicating successful saponification. Full curing takes 4-6 weeks to neutralize any remaining NaOH.

清理

Neutralize any remaining NaOH solution with vinegar before disposal. Rinse all glassware. Wipe down work surfaces.

详情

类别
Organic Synthesis
难度
Intermediate (High School)
时长
60 分钟
预估费用
$10.00
步骤数
8
材料
5

更多实验

乙酸乙酯的费歇尔酯化 90 min 从植物油生产生物柴油 60 min 从茶叶中提取咖啡因 90 min 史莱姆合成（交联PVA） 20 min 对乙酰氨基酚（扑热息痛）的制备 80 min 尼龙6,10的制备（尼龙绳技巧） 30 min 羟醛缩合（二苯亚苄基丙酮） 75 min 阿司匹林（乙酰水杨酸）的合成 90 min 香蕉油（乙酸异戊酯）的合成 90 min 鲁米诺的合成 120 min

Frequently Asked Questions

What is the objective of 皂化反应制皂?
通过植物油与氢氧化钠的皂化反应制造肥皂，演示甘油三酯中酯键的水解。
How difficult is 皂化反应制皂?
This experiment is rated as Intermediate (High School). It takes approximately 60 minutes to complete.
What safety precautions are needed for 皂化反应制皂?
Key safety precautions include: Concentrated NaOH is extremely corrosive; Wear nitrile gloves and goggles at all times; Hot oil and NaOH can cause severe burns.
What materials are needed for 皂化反应制皂?
The main materials required are: Vegetable oil (olive or coconut), Sodium hydroxide (NaOH), Ethanol, Sodium chloride (NaCl), Distilled water.
What results should I expect from 皂化反应制皂?
A solid, white to cream-colored soap that lathers when dissolved in water. The soap may feel slightly slippery, indicating successful saponification. Full curing takes 4-6 weeks to neutralize any remaining NaOH.