Chapter 7 frqs - Chapter Seven frqs by Sam b 1 A 1956 dime is made of a silver-copper alloy and has a mass of 2.490 g The dime was dissolved in nitric

Chapter 7 frqs - Chapter Seven frqs by Sam b 1 A 1956 dime...

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Chapter Seven frqs by Sam b 1. A 1956 dime is made of a silver-copper alloy and has a mass of 2.490 g. The dime was dissolved in nitric acid and a blue solution remained. The solution quantitatively transferred to ta 100-mL volumetric flask and brought to volume with water. (a) A 50.00-mL aliquot of the solution was reacted with excess sodium chloride solution. The precipitate, AgCl, was filtered, washed, and dried. The mass of the precipitate was 1.375 g. What is the percent silver in the dime? (a) (1.375 g AgCl) / (143.3212 g AgCl/mol) x (1 mol Ag / 1 mol AgCl) x (107.8682 g Ag/mol) x (100.0 mL / 50.00 mL) / (2.490 g) = 0.83122 = 83.12% Ag by mass
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  • Spring '17
  • dr. lachman
  • Ion, Sodium chloride, mol Ag

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