Effect of acid rain on sunflower growth
The materials required for this science fair project:
- 1 packet of sunflower seeds
- 5 pots
- Soil required for 5 pots
- 1 bottle of sulfuric acid
- 1 bucket of rain water
- 5 beakers
- pH/litmus paper
- Ruler (1 meter)
1. For this science fair project, the independent variable is the acidity of the water used to water the plants. The dependent variable is the rate of growth of the sunflower plants. This is determined by measuring the average height of the 3 plants in each group. The constants (control variables) are the amount of water used, the amount of sunlight and the type of plant used.
2. The 5 pots are prepared by filling the same amount of soil into each pot. Sunflower seeds are placed in each pot. More than 3 sunflower seeds can be used in each pot in case some of the seeds do not germinate. Once the seeds start to geminate, remove the unwanted plants from the pots.
3. .The 5 pots and 5 beakers are labeled as A, B, C, D and E respectively. Each beaker is filled with 200 ml of rain water. Sulfuric acid is added to the water in each beaker until the following conditions are obtained :
a. Beaker A will have only rain water (pH 6.0)
b. Beaker B will have sulfuric acid added until it measures pH 5.0
c. Beaker B will have sulfuric acid added until it measures pH 4.0
d. Beaker B will have sulfuric acid added until it measures pH 3.0
e. Beaker B will have sulfuric acid added until it measures pH 2.0
4. The sunflower plants are watered using water from beaker A for pot A , beaker B for pot B, beaker C for pot C, beaker D for pot D and beaker E for pot E. They are watered twice a day and observed for 14 days. The average height of the 3 plants is measured every 2 days and recorded in the table below.
Handle acid with care – use protective clothing/goggles.