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Provide complete solution and use the correct number of significant figures in the final answer. 1. Radon-222 has a half-life of 3.8 days. The source water for drinking water treatment plant contains 1250 μmol/L of radon. How long must the water be stored to meet the US EPA limit of 300 μmol/L? 2. Given the titration of acetic acid with sodium hydroxide. a. Calculate the molarity of an acetic acid solution if 24.37 mL of this solution are needed to neutralize 35.29 mL of 0.205 M sodium hydroxide. b. Calculate the pH of the resulting solution. 3. A solution is 0.100 M in substances A and B, which react by a first-order reaction. If the reaction is 15.0% complete in 6.75 min, what is its half-life under these conditions? What would be the half-life if A and B were each at 0.200 M, and how long would it take for 15.0% completion of the reaction?
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