Question

Five of the six treatments in this experiment use a vinegar solution. Why is it important to use a water solution at the beginning of the experiment for Sample A instead of just starting with Sample B?

Answer 1

Because the water acts as a base line or control test. Without this you could not 100% say that acidity has an effect on weathering, because there would be nothing to base your evidence to and compare it to non-acidic solutions.

Answer 2

Sample answer for edge nuity: Testingg limestone with water provides a reference point, or control sample. It shows what happens if no chemical reaction and, therefore, no chemical weathering, takes place.