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CHAPTER+4_Drill_Extra

CHAPTER+4_Drill_Extra - CHAPTER 4/Drills_EXTRA/Chemical...

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CHAPTER 4/Drills_EXTRA /Chemical Reactions in Aqueous Solutions 1. If the concentration of Na + in an aqueous solution of sodium phosphate is 3.20 x 10 -1 mol/L, how many grams of sodium phosphate must have been dissolved in 500. mL to make the solution? ( Ans. 8.75 g ) 2. A stock bottle of aqueous sodium sulfate indicates that the solution is 90.0% Na 3 PO 4 by mass and has a density of 1.20 g/mL. Calculate the molarity of each ion in the solution. ( Ans Na + = 19.7 M ; PO 4 3- = 6.58 M ) 3. What volume of 0.185 M MgCl 2 must be added to 235 mL of 0.206 M KCl to produce a solution with a concentration of 0.250 M Cl - ? ( Ans. 86.2 mL ) 4. A 10.0 g sample of garden compost was analyzed for chloride content. The sample was dissolved in water and the chloride was precipitated as silver chloride. 1.58 g of dried precipitate was obtained. Calculate the percent chloride in the sample. ( Ans. 3.90 %) 5. A 1.80 g sample of barium chloride hydrate, BaCl 2 . xH 2 O is treated with excess sulfuric acid, forming a BaSO 4 precipitate which has a mass of 1.72 g Calculate the value of x. ( An. x = 2 ) 6.
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