Suppose that your laboratory instructor offered you extra credit to analyze the

Question

Suppose that your laboratory instructor offered you extra credit to analyze the cations in a solution that you're told contains only Ba2+ or Ca2+. You are given solutions of the six sodium compounds listed in Table 6, and allowed to divide the unknown solutions into two test tubes for testing purposes.

A)What test would you perform on the solution in the first tube to determine whether or not the solution contains Ba2+? Briefly explain.

B)What test would you perform on the solution in the second tube to determine whether or not the solution contains Ca2+? Briefly explain.

TABLE 6:

Explanation / Answer

reaction with sulphuric acid If a white precipitate is formed which is not water soluble then solution contains Ba2+ Ba2+ + SO42- ---------> BaSO4(s) Reaction with sulphuric acid If a white precipitate is formed which is water soluble then solution contains Ca2+

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