The Scientific Method: Stale Water Your friend claims that he left a glass of wa

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The Scientific Method: Stale Water Your friend claims that he left a glass of water sitting on his kitchen counter for a few days, and when he went back to drink it, it tasted stale. Based on his experience, he has concluded that water "goes bad" like other perishable foods. Is this true? (Try it yourself and see!) For the purposes of this exercise, imagine that you are skeptical of your friend's opinion and decide to test this assertion using the scientific method, the approach used by scientists to explain their observations. Though there are multiple ways of defining it, this process generally consists of five Step #1-. QUESTION: Does water spoil? A question has been raised how do we find the answer? We need a process through which we can make educated guesses, test them, and either support or rule out those guesses; this process is known as the scientific method. Once the initial question is formed, the best thing to do is to seek out information on the subject; perhaps others have already answered this question, or perhaps our understanding of the subject could be improved. This is step #2 of the scientific method: Research. Step #2 .. RESEARCH: Having read various books and websites on the topic, you learn that there are multiple things that might aflect the taste of the water over time: (1) particulates from the air that fall into the water; (2) carbon dioxide gas in the air dissolving into the water to form carbonic acid (3) the growth of bacteria already present in the water; (4) oxygen dissolving out of the water; etc. Having educated yourself on the potential reasons for the water tasting "stale," you can now form an educated prediction based on one of these cases in step 3 of the scientific method: Hypothesis. Step #3-HYPOTHESIS: Water tastes stale because of particulates from the air falling into it. Note that our hypothesis contains a prediction that is specific and testable: We predict that as more contaminants fall into the water glass, the water will taste less fresh. To support (or rule out) that this is what actually happens, we proceed to step 4 of the scientific method: Experiment Step #4-. EXPERIMENT: To prove (or disprove) the hypothesis that particulates are causing the

Explanation / Answer

b. water will taste stale if its is in prolonges contact with the air. More carbon dioxide will enter into the water and get conveted to carbonic acid.

B. Ten glasses of water are filled from same water source. Five of the glasses are sealed from air tight seals and the remaining air is removed. then they are tasted by the same person.
B. Three of the unseales glasses taste stale and 2 of the sealed glasses taste stale. Therefore carbondioxide dissolving in the water is likely to be the cause of water staleness.

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