Abstract: I am doing this experiment to see what the safest water to drink is. This will help society to see what type of water the cleanest and safest water to drink is. I will take samples of all the water and grow bacteria from them to see which water has the least contaminants.
Purpose:
The purpose of this experiment is to compare different types of water, including, well water, city water, bottled water, and water from a water fountain. I plan to take tap water from multiple faucets, with some using well water and others using city, use a brand of bottled water, and samples from a water fountain to grow bacteria. “Water is an excellent solvent and can be sourced from almost anywhere on Earth. This property makes it prone to all kinds
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Take 3 samples of the bottled water, 3 samples of water fountain water, 3 samples of well water, and 3 samples of city water in plastic cups.
2. Label the samples for each, the following way: use "a" to indicate city water, "b" to indicate well water, "c" to indicate Ice Mountain, and "d" to indicate water fountain water. Since there are 3 samples of well, city, water fountain, and bottled water, label the petri dishes 1-3 with the letter following the number that corresponds with the water source.
3. Prepare sterile petri dishes with nutrient agar.
4. Use a swab for each sample. Dip a sample's swab into that individual sample and do five strokes over the agar in the half of the petri dish. On the other half, leave it alone to serve as a control to determine how much bacteria ends up growing on its own. On the outside of the petri dish use a sharpie to draw a line dividing the two sides and leave the controlled side blank.
5. Repeat step four for each sample with a new sterile swab each time.
6. Label the petri dishes according to their samples, and seal each with tape.
7. Then, to take data, each day place the 0.5cm^2 piece of grid paper underneath the petri dish and count the approximate number of bacteria in one