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Post-lab 3-solutions - gonzales(pag757 Post-lab 3...

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gonzales (pag757) – Post-lab 3 – Lyon – (52635) 1 This print-out should have 9 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. Now that you have become familiar with the due dates of your lab assignments, there will be no more reminders in the heading of your assignments. 001 10.0 points When a solution of nickel chloride is mixed with a solution of phosphoric acid, a precip- itate forms. What is the molecular equation for this reaction? 1. NiCl (aq) + HPO 4 (aq) NiPO 4 (s) + HCl (aq) 2. NiCl 2 (aq) + H 2 PO 4 (aq) NiPO 4 (s) + 2 HCl (aq) 3. 3 NiCl 2 (aq) + 2 H 3 PO 4 (aq) Ni 3 (PO 4 ) 2 (s) + 6 HCl (aq) correct 4. 2 NiCl 2 (aq) + 3 H 3 PO 4 (aq) Ni 3 (PO 4 ) 2 (s) + 6 HCl (aq) 5. NiCl 3 (aq) + H 3 PO 4 (aq) NiPO 4 (s) + 3 HCl (aq) Explanation: Nickel chloride is NiCl 2 , and the nickel ion is Ni 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 nickel ions and 2 phosphate ions. That tells you the subscripts in the precipitate as well as the coefficients on the reagents. In a balanced molecular equation the counter ions, Cl - and H + , combine to form 6 HCl molecules. In a net ionic equation, these would be spectator ions and would not appear on either side of the equation. 002 (part 1 of 4) 10.0 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.
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