1. Which chemical is one of the most important in the water treatment process? 2. What is the chemical formula for ammonia? 3. Which two types of water sources commonly contain ammonia? 4. Give 3 ways that ammonia can be added to soil.
1. Before you added the colour changing reagent, did you think the two unfiltered samples had the same amount of iron? 2. Did you change your mind about this after adding the reagent? 3. Why do you think it is important for this experiment that these two samples have the same iron concentration?