How Sweet it is - A Colorful Sugar Solution Density Column | Flinn ... - Free Printable

Problem Overview:

The task involves creating a colorful sugar solution density column, where seven solutions of different densities are prepared and layered in a graduated cylinder to form a vertical rainbow of colors. The goal is to demonstrate the concept of density.

Solution Explanation:

#### Step 1: Understanding Density
Density is defined as the mass per unit volume of a substance. In this experiment, the density of each solution is determined by the concentration of sugar (sucrose) dissolved in water. Solutions with higher sugar concentrations will have higher densities and will settle at the bottom of the graduated cylinder when layered.

#### Step 2: Materials and Setup
The materials required include:
- Sucrose (table sugar)
- Distilled or deionized water
- Food coloring (red, yellow, green, blue)
- Graduated cylinder (1000 mL)
- Separatory funnel (250 mL)
- Glass tubing
- Ring clamp
- Ring stand
- Rubber tubing

The setup involves constructing an apparatus using the separatory funnel, glass tubing, and graduated cylinder, as shown in Figure 2. The glass tubing is used to guide the solutions into the graduated cylinder without disturbing the layers.

#### Step 3: Preparation of Solutions
Seven solutions are prepared with varying concentrations of sugar and food coloring. The concentrations and colors are as follows (from least dense to most dense):

1. Red Solution: 100% water, 0% sugar (least dense)
2. Orange Solution: 10% sugar, 90% water, red-yellow dye
3. Yellow Solution: 20% sugar, 80% water, yellow dye
4. Green Solution: 30% sugar, 70% water, green dye
5. Blue Solution: 40% sugar, 60% water, blue dye
6. Indigo Solution: 50% sugar, 50% water, blue-red dye
7. Violet Solution: 60% sugar, 40% water, blue-red dye (most dense)

Each solution is prepared by dissolving the appropriate amount of sugar in water and adding the corresponding food coloring. The volumes of all solutions should be equal for consistency.

#### Step 4: Procedure
1. Construct the Apparatus:
- Set up the separatory funnel, glass tubing, and graduated cylinder as shown in Figure 2.
- Ensure the glass tubing reaches near the bottom of the graduated cylinder to prevent mixing of solutions during layering.

2. Add Solutions in Order of Density:
- Start by adding the least dense solution (red, 100% water) to the separatory funnel.
- Slowly pour the solution through the glass tubing into the graduated cylinder.
- Repeat this process for each subsequent solution, starting with the least dense and ending with the most dense (violet, 60% sugar).

#### Step 5: Observations
As each solution is added, it will settle at a specific level in the graduated cylinder based on its density. The least dense solution (red) will float on top, while the most dense solution (violet) will settle at the bottom. This creates a beautiful vertical rainbow of colors, demonstrating the principle of density.

#### Safety Precautions
- Follow all laboratory safety procedures.
- Review the Safety Data Sheets for handling and disposal of chemicals.
- Use gloves and goggles to protect yourself from spills or splashes.

Final Answer:

The experiment successfully demonstrates the concept of density by creating a colorful sugar solution density column. The solutions are prepared with varying concentrations of sugar and food coloring, and they are layered in a graduated cylinder from least dense (top) to most dense (bottom). The final result is a visually striking display of density principles.

$$
\boxed{\text{Density Column Created Successfully}}
$$