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2010 USNCO Local #3: Phenolphythalein in a solution

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November 21, 2012

Problem Statement

When phenolphythalein is added to an aqueous solution containing one of the following solutes the solution turns pink. Which solute is present?
<spanclass=′latex−bold′>(A)</span> NaCl<spanclass=′latex−bold′>(B)</span> KC2H3O2<spanclass=′latex−bold′>(C)</span> LiBr<spanclass=′latex−bold′>(D)</span> NH4NO3{ <span class='latex-bold'>(A)</span>\ \text{NaCl} \qquad<span class='latex-bold'>(B)</span>\ \text{KC}_2\text{H}_3\text{O}_2 \qquad<span class='latex-bold'>(C)</span>\ \text{LiBr} \qquad<span class='latex-bold'>(D)</span>\ \text{NH}_4\text{NO}_3 }
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