Làm Xà Phòng Bằng Xà Phòng Hóa

Chuyển đổi chất béo thành xà phòng dùng natri hydroxit

Organic Synthesis Intermediate (High School) 60 phút ~$10,00

Mục tiêu

Làm xà phòng bằng xà phòng hóa dầu thực vật với natri hydroxit, minh họa thủy phân liên kết este trong triglyxerit.

Bối cảnh

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.

Cảnh báo an toàn

  • 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)

PPE cần thiết

goggles gloves lab_coat

Vật liệu

  • 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)

Thiết bị

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

Quy trình

1

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

3 phút
2

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

2 phút NaOH is corrosive
3

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

3 phút Hot caustic mixture
4

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

20 phút
5

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

10 phút
6

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

5 phút
7

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

3 phút Do not use on skin until fully cured
8

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

3 phút

Kết quả dự kiến

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.

Dọn dẹp

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

Chi tiết

Danh mục
Organic Synthesis
Độ khó
Intermediate (High School)
Thời gian
60 phút
Chi phí ước tính
$10,00
Số bước
8
Vật liệu
5

Thí nghiệm khác

Chế Tạo Nylon 6,10 (Thủ Thuật Sợi Nylon) 30 min Chiết Xuất Caffeine Từ Trà 90 min Điều Chế Axetaminophen (Paracetamol) 80 min Este Hóa Fischer Để Tổng Hợp Etyl Axetat 90 min Ngưng Tụ Aldol (Dibenzalaxeton) 75 min Sản Xuất Biodiesel Từ Dầu Thực Vật 60 min Tổng Hợp Aspirin (Axit Axetylsalixylic) 90 min Tổng Hợp Dầu Chuối (Isoamyl Axetat) 90 min Tổng Hợp Luminol 120 min Tổng Hợp Slime (PVA Khâu Mạch) 20 min

Frequently Asked Questions

What is the objective of Làm Xà Phòng Bằng Xà Phòng Hóa?
Làm xà phòng bằng xà phòng hóa dầu thực vật với natri hydroxit, minh họa thủy phân liên kết este trong triglyxerit.
How difficult is Làm Xà Phòng Bằng Xà Phòng Hóa?
This experiment is rated as Intermediate (High School). It takes approximately 60 minutes to complete.
What safety precautions are needed for Làm Xà Phòng Bằng Xà Phòng Hóa?
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 Làm Xà Phòng Bằng Xà Phòng Hóa?
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 Làm Xà Phòng Bằng Xà Phòng Hóa?
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.