Test the pH level of water used to nourish plants to determine if alkaline, acidic or neutral water will have a positive or negative effect. Use sodium hydroxide and hydrochloric acid to change the pH balance of the distilled water used to water the plants. Track the plant's growth and reaction to changed pH levels in the water. Take note of any changes in the plant's height and leaf color. Determine if a high or low pH level is better for the plant based upon your observations.
Place different soil types into separate cups. Check the pH level with a pH meter. Add water to the cups and mix the water with the soil. Measure the pH of the water in each cup. Use distilled water, as it has a neutral pH level. Take note of the changes that occur in the pH level of the water that is mixed with the different soil types. Make your conclusions based upon your observations.
Control the conditions the pots are kept in by placing them in the same temperature, humidity and light. Pour equal amounts of soil into each pot. Add soil sulfur until the pH levels are 6.0, 6.5, 7.0, 7.5 and 8.0. Press your finger in each pot to create a 1 inch deep hole. Bury about 10 seeds in each pot. Use the same amount of water to water the seeds for two weeks. Measure the height of Kentucky bluegrass in five pots. Observe the growth of the grass to determine which pH level is best.
Fill a large beaker with water. Place plants in the two testing cups. Label testing cups AA and AB and place them inside separate large beakers. Add an acid solution to the large beaker containing testing cup AA until the water has a 6.0 pH. Add an alkaline solution to the large beaker containing testing cup AB until the water has a pH of 6.4. Fill the small beakers with water. Place the clamp light in position to shine on both beakers of plants. Measure the volume of the oxygen after 24 hours. Make conclusions based upon your observations.