lab Report Precipitates

Topics: Chemistry, Solubility, Precipitation Pages: 3 (882 words) Published: February 11, 2014

Combining Two Solutions to Form a Precipitate

Introduction
Can two solutions combine to form a precipitate? A precipitate is a, “solid that forms and settles out of a liquid mixture”(3). “When two aqueous solutions of ionic compounds are mixed together, the resulting reaction may produce a solid precipitate.” (1). The hypothesis of this lab is that only 75 percent of the combinations of certain solutions will create a precipitate. Procedure

The materials used in this lab were seven solutions, Pb(NO3)2, Na3PO4, ZnSO4, NaBr, Na2SO3, Zn(C2H3O2)2, and BaCl2, seven pipets, seven beakers, and table or chart to mix the solutions and see the results. First each of the solutions were but into separate container and were labeled correctly. Then the pipets were put in each of the beakers, one for each solution. After, on the table each row and column was labeled with one solution in each. By doing this the solutions that were mixed in each box were easily identified. Then each solution, starting with Pb(NO3)2, was put in their designated boxes on the table or chart. Some solutions overlapped and created mixtures. Those mixtures were then watched to see if a precipitate had been formed. The observations and results were then recorded.

Results

Mixtures that created precipitates:

During this experiment seven different solutions were mixed with seven different solutions, therefore mixtures that were repeated or involved the same to solutions being mixed together were marked as no mixture in this section in the table. If was a mixture the observations for all the mixtures were marked in the appropriate boxes. R in the table meant reaction and NR meant no reaction. The mixtures that did not show reactions to form a precipitate were Pb(NO3)2 and NaBr, Pb(NO3)2 and Zn(C2H3O2)2, Pb(NO3)2 and BaCl2, Na3PO4 and NaBr, Na3PO4 and Na2SO3, ZnSO4 and NaBr, ZnSO4 and Na2SO3, ZnSO4 and Zn(C2H3O2)2, ZnSO4 and BaCl2, NaBr and Na2SO3,...

Bibliography: (1)  "How to Predict Precipitates." About.com Chemistry. N.p., n.d. Web. 03 Jan. 2014. .
(2) "Precipitation Reactions." - Chemwiki. N.p., n.d. Web. 03 Jan. 2014. .
(3) Wilbraham, Anthony C., Denis D. Staley, Michael S. Matta, and Edward L. Waterman. Chemistry. Boston: Prentice Hall, 2007.
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