Qualitative Analysis-Part 2 Anions Essay

Chloride Solution + 0. 1M AgNO3 =white precipitate formed, very fine texture. Iodide solution + 0. 1M AgNO3 =yellow/white precipitate formed, cloudy texture. Silver Chloride + ammonium hydroxide = white precipitate forms, slowly begins to disappear. Adding HNO3 the reappearance of a white precipitate began, indicating the presence of the chloride. SO4 solution + 0. 5mL of BaCl2-CaCl2 = heated for about 10minutes, fine white precipitate throughout test tube. 5drops of 6M HCl + SO4 = no change indicating no reaction took place, confirming that sulphate is not present in solution. Unknown Substance: When testing for carbonates, little to no reaction took place indicating no presence of carbonates. While testing for Chloride and Iodide, my solution reacted with sulphric acid and a yellow-ish colour change took place. No reaction took place when added to hydrochloric acid or barium hydroxide. Sulphate was tested for and no reactions or changed underwent, confirming that it is not present in the solution. Ammonium hydroxide was not needed due to Ag not being present in solution. Iodide present, upon liberation of CH2Cl2 solution, red-ish/brown colour change along with 2 separate layers forming. Discussion: In wastewater and drinking water today, there are many ions and anions alike that we make come into contact with and have to test for. These tests allowed me to get a first hand experience on testing for certain anions in a known and unknown substance. It is important to be able to detect substance in solutions, known tests are designed to allow one chemical react with another chemical to confirm the presence or absence of anions. By running a series of reactions, it provides a clear understanding of what chemicals are present in what solutions. This then allowed me to test for unknown anions in an unknown solution. These tests are important because it could cause the plants to change the processes that are taken to clear and purify our water. Conclusion: My solution was present with Iodide after running a series of experiments. It is known that a red/brown colour change will partake and two layers will form. Both of these things took place confirming what was mentioned above. Questions: 1. What is an ion? An ion is an atom or molecule that undergoes change. 2. What is a polyatomic anion? A polyatomic anion is a charged ion made up of 2 or more atoms covalently bonded. 3. What products are produced when an acid like H2SO4 reacts with a carbonate like CaCO3? Why is this type of reactions so important for the fresh waters of southern Ontario? H2CO3 and CaSO4 would be produced, this type of reaction is important to the fresh waters of southern Ontario because this allows for better for vegetation which helps keep the water clean. 4. What is a quantitative analysis? How does it differ from a qualitative analysis? A quantitative analysis is the detection of the presence of chemical elements in an unknown substance as to where qualitative analysis used to separate