Experiments

Experiment 1

Problem: We were wondering if the people that we tested could tell if water was clean by looking at it.

Hypothesis: We don't think that people can tell if water is clean by looking at it, because even clear water can be contaminated.

Experiment: We had three bottles with a different kind of water in each. The first had dirt and water, the second had zinc, and the third one had food coloring, cumin seeds and filtered water. We then decided to test 24 people and we went around asking them which of the three different kinds of water they would rather drink.

Materials:   -3 little plastic bottles    - food coloring     - water filtering syringe

                   -dirt                            - zinc                   - little filters

                  - water                        - cumin seeds          

    Experiment 2 

Problem: We wanted to see which of three substances (calcium carbonate rocks, Tums, or baking soda) filtered water the fastest and which of them would get the highest PH.

Hypothesis:  We thought that the calcium carbonate rocks would be the best at filtering water because scientists use them.

Experiment: We had three bowls in which we added a bit of water and acidic acid (vinegar) and tested the PH which was 2. Then we added a bit of every substance separately in each bowl to see which of the three (calcium carbonate rocks, Tums or baking soda) could take out most of the acidic acid in the shortest amount of time, and then we took the PH from each bowl.

Materials: - 3 bowls                                  - water                   - PH strips

                   - calcium carbonate rocks         -  baking soda       

                 - Tums                                        -  acidic acid