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Post-lab 3 - burgin(lcb626 Post-lab 3 anderson(53245 This...

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burgin (lcb626) – Post-lab 3 – anderson – (53245) 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. 2 Co(NO 3 ) 2 ( aq ) + 3 H 3 PO 4 ( aq ) Co 3 (PO 4 ) 2 ( s ) + 6 HNO 3 ( aq ) 2. 3 Co(NO 3 ) 2 ( aq ) + 2 H 3 PO 4 ( aq ) Co 3 (PO 4 ) 2 ( s ) + 6 HNO 3 ( aq ) 3. Co(NO 3 ) 3 ( aq ) + H 3 PO 4 ( aq ) Co 3 PO 4( s ) + 3 HNO 3 ( aq ) 4. CoNO 3( aq ) + H 3 PO 4 ( aq ) CoPO 4( s ) + HNO 3 ( aq ) 5. Co(NO 3 ) 2 ( aq ) + H 2 PO 4 ( aq ) CoPO 4 ( s ) + 2 HNO 3 ( aq ) 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 added to both beakers in order to make a dis- tinction between the two solutions. In each case identify the precipitate that is formed.
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