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Find the concentration of iron(III) ions and nitrate ions in the solution.40.4 g of...

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xinchaoyo | Student, Grade 11 | Honors

Posted January 20, 2012 at 9:15 AM via web

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Find the concentration of iron(III) ions and nitrate ions in the solution.

40.4 g of Fe(NO3)3. 9H2O is dissolved in sufficient water to make up one litre of solution.

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justaguide | College Teacher | (Level 2) Distinguished Educator

Posted January 20, 2012 at 12:18 PM (Answer #1)

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40.4 g of Fe(NO3)3.9H2O is dissolved in a sufficient volume  of water to create one liter of the solution. Each unit of Fe(NO3)3.9H2O provides 3 nitrate ions and one iron ion.

The molar mass of Fe(NO3)3.9H2O is 403.99

40.4 g of Fe(NO3)3.9H2O is approximately equivalent to 40.4/404.4 = 0.1 moles

As each unit of the hydrated iron nitrate contributes one unit of iron(3) ions, the concentration of iron(3) ions in the solution is 0.1 moles/liter.

As each unit of the hydrated iron nitrate contributes 3 units of nitrate ions, the concentration of nitrate ions if 0.3 moles/liter.

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