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Published on Apr 2, 2012
#10 Density Tower
We learned about density in the Crazy Carbon experiment. Density determines how much matter is packed in an object. Different solutions have different densities. Some can be heavier or lighter than water!
Ingredients: • 5 ml (1 tsp) gelatin • 10 ml (2 tsps) detergent powder • 15 ml (3 tsps) sugar • Warm water • Pinches of powdered pigments • 5 vials • Stir sticks • 4 pipettes
Method: 1. Add gelatin to one vial and fill to top with warm water. Mix with stir stick. Add a bit of pigment. 2. Add detergent powder in a second vial and fill to top with warm water. Mix with stir stick. Add in a different color of pigment. 3. Add sugar in a third vial and fill to top with warm water. Mix with stir stick. Add in a different color of pigment than the first two. 4. Fill a fourth vial with water. Color the water differently than the first three. 5. Use pipettes to layer the solutions into the fifth vial one at a time. A single pipette can contain 3 ml of solution. Add 6 ml of each solution into the density tower. Hold the pipette up against the inner wall of the density tower vial. Gently squeeze out the solutions in the order provided below. Tip: When pipetting the gelatin solution, gently squeeze out the solution while rotating the vial to distribute evenly.
Follow this order for placing the ingredients: 1. Sugar solution (bottom layer) 2. Detergent powder (second layer) 3. Gelatin (third layer) 4. Water (top layer)