Мыловарение (реакция омыления)
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Превращение жиров в мыло с помощью гидроксида натрия
Цель
Изготовить мыло омылением растительного масла гидроксидом натрия, показав гидролиз сложноэфирных связей в триглицеридах.
Предпосылки
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.
Предупреждения по безопасности
- 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)
Требуемые СИЗ
Материалы
-
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)
Оборудование
Процедура
Heat 20 mL of vegetable oil in the beaker to about 40°C on the hot plate.
Mix 10 mL of 6M NaOH with 10 mL ethanol in a separate container.
Slowly add the NaOH/ethanol mixture to the warm oil while stirring continuously.
Continue heating and stirring at 60-70°C for 20 minutes until the mixture becomes thick and opaque (trace).
Add 50 mL of saturated NaCl solution to salt out the soap. Stir and allow to cool.
Filter the solid soap through cheesecloth. Press out excess liquid.
Mold the soap into a shape and allow to dry for 24 hours.
Test a small piece by dissolving in warm water — it should produce lather.
Ожидаемые результаты
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.
Уборка
Neutralize any remaining NaOH solution with vinegar before disposal. Rinse all glassware. Wipe down work surfaces.
Детали
- Категория
- Organic Synthesis
- Сложность
- Intermediate (High School)
- Продолжительность
- 60 мин
- Прим. стоимость
- $10,00
- Шаги
- 8
- Материалы
- 5