1. The objective consists in finding the PH of acidic water distilled water tap water The tools and materials are: Fourier accessories 3 beakers netbook distilled water acidic water tap water The pH measures the acidity of a solution. The pH scale ranges: from 0 to 14; from 0 to 7 for acid ; from 7 to 14 for basic ; 7 is the value of neutrality.

2. This graph represents the ph of distilled water. The value of pH varies from 7 to 7.4: the distilled water is basic.

3. This graph represents the ph of tap water. The value of pH varies from 7.3 to 7.4: the distilled water is basic.

4. This graph represents the ph of acid water. The value of pH varies from 2.22 to 2.16: the distilled water is acid.

5. The distilled water has the ph of 7, the tap water has ph between 7 to 8 and acid water has ph 2. The distilled and acid water decrease in time, while the ph of tap water increases. We have used the acid water solution instead of rainwater because it was impossible to collect real samples of rainwater. Ph sensor