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SCAN0003 - 2 A solution is prepared by dissolving 25.8...

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Unformatted text preview: 2. A solution is prepared by dissolving 25.8 grams on magnesium chloride (MgClZ) in water to produce 250.0 mL of solution. Calculate the molarity of the chloride ion in the solution. {I {2 (I. (a) 0.271 Molar (b) 1.08 Molar (c) 2.17 Molar “WWII IIIWIIIIWW I IIIW IIIIIIWIIWI m WWIIIWIN IIWIII‘I.IIIIWWI.WIII~IIIWIIWIIIIIMIWW 3. The Great Salt Lake, located in the state of Utah, is approximately eight times saltier than the ocean. The salinity of the lake is said to occasionally be as high as 27 parts per thousand sodium chloride. Calculate the molarity of the sodium ion in the Great Salt Lake. Assume d=1g/mL {A (a) 4.6 X 10‘4 Molar Na+ p (b) 0.46 Molar Na+ r (c) 1.2 Molar Na+ III I Wm IIIIIII» III. IIIIIIII “WWII“ «WI wI MW IWWII-IIIWII I..- IIIIIIIIIIIIIW WWIIINIII 4. The ethyl alcohol content of many beers produced in the United States is 4. 05% (vol/vol). If the density of ethyl alcohol at room temperature is 0.7893 grams per mL, what is the percent of ethyl alcohol in beer expressed as percent (wt/vol)? {N (a) 3.20% ethyl alcohol (wt/vol) {W (b) 5.13% ethyl alcohol (wt/vol) if (c) 7.80 ethyl alcohol (wt/vol) IIIWIIII WWWIIWWMI WIIWIWW I.III WWWI I III WWII-III I IVIWWI “WWII“ I. I. II III II MIIIII. I III .. I 5. An analytical procedure required the preparation of a solution containing 100.0 ppm chromium. How many grams of potassium dichromate (KZCr207) would be required to prepare 1.000 liter of this solution? {W (a) 0.2829 g chr207 f“ (b) 0.1000 g KZCrzoy {5 (c) 0.5658 g KICrZOI 6. Calculate the formal concentration of a sodium acetate solution prepared by diluting 45.0 mL of a solution containing 25.0 ppm sodium acetate (NaC2H 302) to a total of 0.500 liters of solution. F (a) 6.10 X 10-4 M NaczHIOI in (b) 1.37 X 10*6 M NaC2H302 {N (c) 2.75 X 105 molar NaC2H302. ...
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