4.2: Precipitation reactions 5. Add a few drops of ammonium carbonate solution i

Question

4.2: Precipitation reactions 5. Add a few drops of ammonium carbonate solution into each test tube that was used for the flame test. Record any evidence of chemical changes (color, cloudiness, etc) Discard the solutions/precipitates following the directions of your laboratory instructor Clean the test tubes with deionized water. Add 10 drops of each metal ion solution into separate test tubes. Add a few drops of ammonium sulfate solution into each test tube. Record any evidence of chemical changes. Discard the solutions/precipitates following the directions of your laboratory instructor 6. 7. Repeat the previous step with ammonium phosphate in place of ammonium sulfate. Write molecular equations and net ionic equations for an example of the listed type of reaction. Organize the types of metals by the observed flame test colors. 8.

Explanation / Answer

As the ammonium salts of carbonate ,sulfate and phosphates are soluble salts and can react with other metal ions present in the compounds which are used for the flame test to (some of metals which can ) form precipates and hence this salts can be used to detect some other metals or atleast can show some chemical change due to the displacement reaction occured whereas barium salts of these anoins are itself insoluble and becomes precipitate as soon as added to the solution and thus no chemical reaction occurs and hence no such observation .

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