Exercises for Gravimetry, Exercises of Analytical Chemistry

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1. A 50. 00 - mL solution containing NaBr was treated with excess AgNO 3 to precipitate 0. 2146 g of AgBr (FM
2. 772 ). What is the molarity of NaBr in the solution?

2. To find the Ce 4 + content of a solid, 4. 37 g were dissolved and treated with excess iodate to precipitate Ce(IO 3

4

. The precipitate was collected, washed well, dried, and ignited to produce 0. 104 g of CeO 2

(FM

172. 114 ). What was the weight percent of Ce in the original solid?

4. A mixture weighing 7. 290 mg contained only cyclohexane, C 6

H

12 (FM 84. 159 ), and oxirane, C 2

H

4

O

(FM 44. 053 ). When the mixture was analyzed by combustion analysis, 21. 999 mg of CO 2

(FM 44. 010 )

were produced. Find the weight percent of oxirane in the mixture.

5. Consider a mixture of the two solids BaCl 2

• 2 H

2

O (FM

244. 26 ) and KCl (FM 74. 551 ), in an unknown ratio. When the unknown is heated to 160 °C for 1 hr, the water of crystallization is driven off. A sample originally weighing
245. 783 g weighed 1. 562 g after heating. Calculate the weight percent of Ba, K, and Cl in the original sample.