1 In Part A it was determined that the precipitate of the unknown solution

1 in part a it was determined that the precipitate of

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1 In Part A it was determined that the precipitate of the unknown solution contained silver as a white precipitate of AgCl was formed at the end. In step 5, the sample was put in a boiling water bath to fully decant the precipitate and evaporate any liquid still present from the wash done in the previous step. In Part B, it was determined that the liquid solution of the unknown solution contained barium as a white precipitate of BaSO 4 was formed. In step 12, K 2 CrO 4 was added to the solution to determine whether barium or calcium was present. It can be determined which is present whether a precipitate is formed or not since BaCrO 4 is insoluble, forming a precipitate, and CaCrO 4 is completely soluble. 2 A “false positive” occurs when a test has mistakenly been found for. This could be possible before step 12 if the solution is not completely free of precipitate. All the results obtained were expected as the correct precipitate formed when a certain chemical was added to the solution. In Part C, a flame test of different metal solutions was conducted and based on the color produced, the specific cation could be determined. This is effective since each cation has a
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  • Fall '08
  • leytner
  • Solubility, tube, precipitate, white precipitate

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