Ammonia and potassium iodide solutions are added to an aqueous solution of Cr(NO 3 ) 3 . A solid is isolated (compound A), and the following data are collected: i. When 0.105 g of compound A was strongly heated in excess 0 2, 0.0203 g CrO 3 was formed. ii. In a second experiment it took 32.93 mL of 0.100 M HCI to titrate completely the NH 3 present in 0.341 g compound A. iii. Compound A was found to contain 73.53% iodine by mass. iv. The freezing point of water was lowered by 0.64°C when 0.601 g compound A was dissolved in 10.00 g H 2 O ( K f =1.86°C·kg/mol). What is the formula of the compound? What is the structure of the complex ion present? ( Hints: Cr 3+ is expected to be sixcoordinate, with NH 3 and possibly I − as ligands. The I − ions will be the counterions if needed.)

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Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
BuyFind

Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243

Solutions

Chapter 20, Problem 99IP
Textbook Problem

Ammonia and potassium iodide solutions are added to an aqueous solution of Cr(NO3)3. A solid is isolated (compound A), and the following data are collected:

i. When 0.105 g of compound A was strongly heated in excess 0 2, 0.0203 g CrO3 was formed.

ii. In a second experiment it took 32.93 mL of 0.100 M HCI to titrate completely the NH3 present in 0.341 g compound A.

iii. Compound A was found to contain 73.53% iodine by mass.

iv. The freezing point of water was lowered by 0.64°C when 0.601 g compound A was dissolved in 10.00 g H2O (Kf =1.86°C·kg/mol).

What is the formula of the compound? What is the structure of the complex ion present? (Hints: Cr3+ is expected to be sixcoordinate, with NH3 and possibly I as ligands. The I ions will be the counterions if needed.)

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Chapter 20 Solutions

Chemistry: An Atoms First Approach
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