# Experiment 13 ## Advance Study Assignment 1. An unknown that might contain any of the seven ions studied in this experiment (but no other ions) has the following properties: a. On addition of 1 M HCl , bubbles form. b. When $0.1 \mathrm{M} \mathrm{BaCl}_{2}$ is added to the acidified unknown, a white precipitate results. c. When $0.1 \mathrm{M} \mathrm{AgNO}_{3}$ is added to the unknown, a clear solution results. On the basis of the preceding information, classify each of the following ions as present (P), absent (A), or undetermined (U) by the tests described: | $\mathrm{CO}_{3}{ }^{2 -}$ | $\mathrm{SO}_{4}{ }^{2 -}$ | $\mathrm{PO}_{4}{ }^{3 -}$ | $\mathrm{SCN}^{-}$ | | :-- | :-- | :-- | :-- | | $\mathrm{Cl}^{-}$ | $\mathrm{Al}^{3 +}$ | $\mathrm{Cu}^{2 +}$ | |

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Step 1
: Identify the ions based on the reactions described.

Hence, $\mathrm{SCN}^{-}$ is absent.
a. Carbonate is a strong base and reacts with acids to form carbon dioxide. b. c. d.

Step 2
: Summarize the results.

| $\mathrm{SCN}^{-}$ | A |
| Ion | Present (P) or Absent (A) or Undetermined (U) | | --- | --- |

Final Answer

| $\mathrm{SCN}^{-}$ | A |

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