Ammonia and potassium iodide solutions were added to an
Chapter 19, Problem 19.81(choose chapter or problem)
Ammonia and potassium iodide solutions were added to an aqueous solution of Cr(NO3)3. A solid was isolated (compound A), and the following data were collected: i. When 0.105 g of compound A was strongly heated in excess O2, 0.0203 g of CrO3 was formed. ii. In a second experiment, it took 32.93 mL of 0.100 M HCl to titrate completely the NH3 present in 0.341 g of compound A. iii. Compound A was found to contain 73.53% iodine by mass. iv. The freezing point of water was lowered by 0.648C when 0.601 g of compound A was dissolved in 10.00 g of H2O (Kf 5 1.868C kg/mol). What is the formula of the compound? What is the structure of the complex ion present? [Hints: Cr31 is expected to be six-coordinate with NH3 and (possibly) I2 acting as ligands. The I2 ions will be the counter ions if needed.]
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