Suppose that you are given four test tubes, labeled A, B, C, and D, each contain

Question

Suppose that you are given four test tubes, labeled A, B, C, and D, each containing a colorless solution. In each of the following questions, indicate which of the solutions included in this experiment could be used to distinguish between the pairs of solutions. Use the information in the table on the previous page to help you make a choice. In each case, describe the observations you would make and write a net ionic equation for any reaction that would occur. Test Tube A contains 0.1M NaNO_3 solution, and Test Tube B contains 0.1 M Ba(NO_3)_2 solution. Test Tube C contains 0.1M NaCl solution and Test Tube D contains 0.5M HCl.

Explanation / Answer

1) add H2SO4 in each test tube. Tube B will have precipitate of BaSO4. Sodium sulphate is soluble.

Ba2++SO42-=BaSO4(ppt)

2). Add Na2CO3 in each tube. CO2 would evolve from tube D

2H++CO32-=H2O+CO2

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