Crazy Currents, by V.S.

Question
Where is the gas formed and how can we see this during the chemical reaction of vinegar and baking soda?

Hypothesis
This gas is formed as bubbles inside the mixture.

Equipment
Baking soda
Vinegar
raisins/sultanas
measuring spoons
container

Method
1. The vinegar is poured into the container.
2. The baking soda is sprinkled in the vinegar.
3. The sultanas are added.

Observation
1. The bubbles formed when the baking soda and vinegar mixed.
2. The sultanas travelled to the top of the vinegar and then down. This repeated until the bubbles disappeared.

Explanation
The sultanas moved to the top because the bubbles of Co2 formed under the sultanas & pushed them to the top. At the top, the bubbles popped & released gas, causing the sultanas to fall. This process repeated until there were no more bubbles. This proves that when you mix baking soda and vinegar, the gas is formed as bubbles inside the mixture.