Postlab3 - patino(mp25752 – Post-lab 3 – Lyon –(53385...

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Unformatted text preview: patino (mp25752) – Post-lab 3 – Lyon – (53385) 1 This print-out should have 9 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 2.0 points When a solution of cobalt (II) nitrate is mixed with a solution of phosphoric acid, a precip- itate forms. What is the molecular equation for this reaction? 1. 3 Co(NO 3 ) 2 ( aq ) + 2 H 3 PO 4 ( aq ) → Co 3 (PO 4 ) 2 ( s ) + 6 HNO 3 ( aq ) correct 2. Co(NO 3 ) 3 ( aq ) + H 3 PO 4 ( aq ) → Co 3 PO 4( s ) + 3 HNO 3 ( aq ) 3. 2 Co(NO 3 ) 2 ( aq ) + 3 H 3 PO 4 ( aq ) → Co 3 (PO 4 ) 2 ( s ) + 6 HNO 3 ( aq ) 4. Co(NO 3 ) 2 ( aq ) + H 2 PO 4 ( aq ) → CoPO 4 ( s ) + 2 HNO 3 ( aq ) 5. CoNO 3( aq ) + H 3 PO 4 ( aq ) → CoPO 4( s ) + HNO 3 ( aq ) Explanation: Cobalt (II) nitrate is Co(NO 3 ) 2 , and the cobalt ion is Co 2+ . Phosphoric acid is H 3 PO 4 , and the phosphate ion is PO 3- 4 . The solid precipitate must be neutral, so to balance the +2’s with- 3’s, you need 3 cobalt ions and 2 phosphate ions. That tells you the subscripts in the precipitate as well as the coefficients on the reagents. In the balanced molecular equation the counter ions, NO- 3 and H + , combine to form 6 HNO 3 molecules. 002 (part 1 of 4) 3.0 points In each of the following four situations, imagine that you have two unlabeled beakers in front of you which contain the two solu- tions listed. For each set of solutions, select a reagent from the list provided that could be...
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This note was uploaded on 10/21/2009 for the course CH 53395 taught by Professor Lyon during the Spring '09 term at University of Texas.

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Postlab3 - patino(mp25752 – Post-lab 3 – Lyon –(53385...

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