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1. The sulfur dioxide present in air is responsible for the "acid rain" phenomenon. One can calculate its concentration by titrating against a standard permanganate solution as follows:
5 SO2 + 2 MnO4-1 + 2 H2O → 5 SO4-2 + 2 Mn+2 + 4 H+
How many grams of SO2 are present in a sample if 7.37 mL of a 0.00800 M KMnO4 solution is needed for the titration? Answer 9.45 x 10-3 grams
2. Calculate the molarity of (a) 6.57 g of methanol (CH3OH) in 150. mL of solution and (b) 10.4 g of calcium chloride in 220. mL of solution. Answers (a) 1.37 M (b) 0.426 M
3. Water is added to 25.0 mL of a 0.866 M KNO3 solution until the final volume is exactly 500. mL. What is the concentration of the final solution? Answer 0.0433 M
4. A 1.00 mL solution of a radioactive sample exhibiting 1.00 x 109 counts per minute is placed in a tank containing water, and the tank's water is stirred until the radioactivity is completely distributed. A 1.00 mL sample of the water is then removed and found to exhibit 5.00 x 102 counts per minute. What is the volume of the water in liters? Answer 2000 liters
5. Calculate the volume of 0.150 M HCl needed to completely neutralize 25.00 mL of 0.125 M NaOH. Answer 20.8 mL
Show all the steps in the mechanism for the following reaction, When benzene is mixed with deuterated sulfuric acid, deuterium is slowly incorporated onto the ring. Show the mechanism for this reaction and explain how this relates the sulfonation of ..
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