In chemistry, precipitation is when a reaction occurs that causes a solid to form in a clear solution.  This can be observed as the formation of a solid mass, an opaque mixture, a powdery substance, or some individual crystals.   4 examples of precipitation reactions are shown above. Precipitation reactions are often used as a method to identify specific ions in an unknown.  Select all of the reactions below that could be precipitation reactions. Group of answer choices MgNO3(aq) + NaCl(aq) --> MgCl2(aq) + NaNO3(aq) Na2S (aq) + 2 LiCl (aq) --> Li2S (s) + 2 NaCl (aq) MgCl2(aq) + 2 LiNO3(aq) -->  2 LiCl (aq) + Mg(NO3)2 (aq) PbNO3(aq) + NaCl(aq)  -->  PbCl (s) + NaNO3 (aq) 2H2O (l) --> 2 H2 (g) + O2 (g)

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter3: Chemical Reactions
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In chemistry, precipitation is when a reaction occurs that causes a solid to form in a clear solution.  This can be observed as the formation of a solid mass, an opaque mixture, a powdery substance, or some individual crystals.   4 examples of precipitation reactions are shown above. Precipitation reactions are often used as a method to identify specific ions in an unknown.  Select all of the reactions below that could be precipitation reactions.

Group of answer choices
MgNO3(aq) + NaCl(aq) --> MgCl2(aq) + NaNO3(aq)
Na2S (aq) + 2 LiCl (aq) --> Li2S (s) + 2 NaCl (aq)
MgCl2(aq) + 2 LiNO3(aq) -->  2 LiCl (aq) + Mg(NO3)2 (aq)
PbNO3(aq) + NaCl(aq)  -->  PbCl (s) + NaNO3 (aq)
2H2O (l) --> 2 H(g) + O(g)
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