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2010 USNCO Local #6: Reagent for Precipitation

Source:

November 21, 2012

Problem Statement

An aqueous solution is known to contain Ag+,Mg2+,\text{Ag}^+, \text{Mg}^{2+}, and Sr2+\text{Sr}^{2+} ions. Which reagent should be used to selectively precipitate the Ag+\text{Ag}^+?
<spanclass=′latex−bold′>(A)</span> 0.20M NaCl<spanclass=′latex−bold′>(B)</span> 0.20M NaOH<spanclass=′latex−bold′>(C)</span> 0.20M Na2SO4<spanclass=′latex−bold′>(D)</span> 0.20M Na3PO4{ <span class='latex-bold'>(A)</span>\ 0.20 \text{M NaCl} \qquad<span class='latex-bold'>(B)</span>\ 0.20 \text{M NaOH} \qquad<span class='latex-bold'>(C)</span>\ 0.20 \text{M Na}_2\text{SO}_4 \qquad<span class='latex-bold'>(D)</span>\ 0.20 \text{M Na}_3\text{PO}_4 }
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