After boiling off the water, there was a whitish powder left in the bottom of the container. One group member claimed this is either citric acid or baking soda. Another group member disagreed and claimed that this might be a third new substance that was produced in the chemical reaction. They tested the properties of the unknown powder left over and compared it to samples of citric acid and baking soda to try to determine which claim is correct. What is the unknown powder?
1) Citric acid
2) Baking soda
3) A new substance
4) Cannot be determined
