Kolom Kerapatan Pelangi

Menumpuk cairan dengan kerapatan berbeda untuk menciptakan kolom berwarna

Classroom Demonstrations Beginner (Middle School) 30 menit ~$8,00

Tujuan

Demonstrasikan konsep kerapatan cairan dengan melapisi cairan yang tidak dapat bercampur dengan kerapatan berbeda dalam kolom tinggi.

Latar Belakang

Different liquids have different densities, and immiscible liquids will arrange themselves with the densest at the bottom and the least dense at the top. By carefully layering liquids such as honey, corn syrup, dish soap, water, vegetable oil, and rubbing alcohol, a dramatic rainbow column can be created. Small solid objects placed in the column float at the interface matching their density, further illustrating the concept.

Peringatan Keselamatan

  • Rubbing alcohol is flammable — no open flames
  • Some liquids are sticky — clean spills immediately
  • Do not drink any of the layered liquids

APD yang Diperlukan

goggles

Bahan

  • Honey (50 mL)
    Density ≈ 1.42 g/mL
  • Corn syrup (50 mL)
    Density ≈ 1.38 g/mL
  • Maple syrup (50 mL)
    Density ≈ 1.32 g/mL
  • Dish soap (50 mL)
    Density ≈ 1.06 g/mL
  • Water (dyed blue) (50 mL)
    Density = 1.00 g/mL
  • Vegetable oil (50 mL)
    Density ≈ 0.92 g/mL
  • Rubbing alcohol (dyed red) (50 mL)
    Density ≈ 0.79 g/mL
  • Food coloring (Various)
    To distinguish water and alcohol layers

Peralatan

Tall clear glass or graduated cylinder (500 mL) Funnel or turkey baster Small objects: grape, cherry tomato, ping pong ball, bolt, cork

Prosedur

1

Start with the densest liquid: pour honey slowly into the bottom of the tall glass.

2 menit
2

Tilt the glass slightly and pour corn syrup slowly down the side. It should form a distinct layer on top of the honey.

3 menit
3

Continue adding layers in order of decreasing density: maple syrup, dish soap, blue-dyed water, vegetable oil, and red-dyed rubbing alcohol.

15 menit Pour very slowly for clean layers
4

Observe the distinct layers. Gently drop small objects (grape, bolt, cork, ping pong ball) into the column and note where they settle.

5 menit
5

Discuss why the layers form (density differences), why some are miscible and some immiscible, and why objects float at specific levels.

5 menit

Hasil yang Diharapkan

Seven distinct layers should be visible, creating a colorful rainbow column. A metal bolt sinks to the bottom, a grape rests on the corn syrup, a cherry tomato on the dish soap, and a ping pong ball floats on top. Cork floats on the water layer.

Pembersihan

Pour the column into a waste container (do not pour down the drain due to oil and syrup). Wash the glass with hot soapy water.

Detail

Kategori
Classroom Demonstrations
Tingkat Kesulitan
Beginner (Middle School)
Durasi
30 menit
Perkiraan Biaya
$8,00
Langkah
5
Bahan
8

Eksperimen Lainnya

Cairan Non-Newton: Ooblek 20 min Gelas Kimia yang Menghilang (Pencocokan Indeks Bias) 15 min Kemiluminensensi dengan Luminol 30 min Pasta Gigi Gajah 20 min Pembakaran Magnesium dalam Es Kering 25 min Pembekuan Seketika: Air Superdingin 120 min Reaksi Jam Iodin 45 min Reaksi Natrium dan Air 25 min Reaksi Osilasi Briggs-Rauscher 40 min Reaksi Termit 30 min

Frequently Asked Questions

What is the objective of Kolom Kerapatan Pelangi?
Demonstrasikan konsep kerapatan cairan dengan melapisi cairan yang tidak dapat bercampur dengan kerapatan berbeda dalam kolom tinggi.
How difficult is Kolom Kerapatan Pelangi?
This experiment is rated as Beginner (Middle School). It takes approximately 30 minutes to complete.
What safety precautions are needed for Kolom Kerapatan Pelangi?
Key safety precautions include: Rubbing alcohol is flammable — no open flames; Some liquids are sticky — clean spills immediately; Do not drink any of the layered liquids.
What materials are needed for Kolom Kerapatan Pelangi?
The main materials required are: Honey, Corn syrup, Maple syrup, Dish soap, Water (dyed blue).
What results should I expect from Kolom Kerapatan Pelangi?
Seven distinct layers should be visible, creating a colorful rainbow column. A metal bolt sinks to the bottom, a grape rests on the corn syrup, a cherry tomato on the dish soap, and a ping pong ball floats on top. Cork floats on the water layer.