π§ͺ Science with Sarah: Baby oil lava lamps ππ‘

A heat-free way to see mixtures, solutions, and density at work

Hello parents, teachers and students! If youβre looking for a fizzy, fun experiment, look no further! Making these baby oil lava lamps will teach your students about mixtures, solutions, and density.

Be sure to check out GMSA@9 on Wednesdays when Meteorologist Sarah Spivey does the demonstrations and explains the science behind it.

HEREβS WHAT YOUβLL NEED

• Clear plastic or glass bottles (smooth sides preferred). For fun, I used an Erlenmeyer flask to make this experiment look more science-y π
• Baby oil
• Water
• Food dye
• Alka-Seltzer tablets

DO THE EXPERIMENT

• STEP 1: Fill the bottle about 3/4 the way with baby oil
• STEP 2: Add some water and watch it sink to the bottom
• STEP 3: Put a few drops of food dye into the bottle. The dye should sink to the bottom and mix with the water
• STEP 4: Add an Alka-Seltzer tablet to the bottle. The gas should cause the colored water to rise and bubble up throughout the baby oil

HOW IT WORKS

This is a good example of solutions, mixtures, and density.

DENSITY: The water and food dye are more dense than water, so they sink to the bottom of the bottle.

MIXTURE: Water and oil do not mix into a solution, so the colored water stays separate from the baby oil. Thus, the baby oil and the colored water form a mixture, rather than a solution.

SOLUTION: The Alka-Seltzer tablet contains sodium bicarbonate and citric acid which produces carbon dioxide gas when mixed with the colored water.

SCIENCE WITH SARAH

If youβd like Sarah and David to come to your school and conduct a science experiment live on KSAT, email sciencewithsarah@ksat.com.

Parents and guardians: upload a video of your child performing the activity by clicking here. Send it in and you might see it on GMSA @ 9 a.m.!