QQuestionAnatomy and Physiology
QuestionAnatomy and Physiology
# 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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