rovide a test (including reagents needed and what to look for if it gives a positive result), and the net ionic equation for the test used, to distinguish berween the following compounds. NiCl, or BaCl, NaC,H,O, or KSCN: ZnS or CuS:
rovide a test (including reagents needed and what to look for if it gives a positive result), and the net ionic equation for the test used, to distinguish berween the following compounds. NiCl, or BaCl, NaC,H,O, or KSCN: ZnS or CuS:
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:### Educational Website Content: Chemical Compound Identification
**Objective:**
Provide a test (including reagents needed and what to look for if it gives a positive result), and the net ionic equation for the test used, to distinguish between the following compounds.
**Compound Pairs:**
1. **NiCl₂ or BaCl₂:**
- **Test:** Add sodium sulfate (Na₂SO₄) to the solution.
- **Observation:** If a white precipitate forms, it indicates the presence of BaCl₂ due to the formation of barium sulfate (BaSO₄), which is insoluble in water.
- **Net Ionic Equation:**
\( \text{Ba}^{2+} (aq) + \text{SO}_4^{2-} (aq) \rightarrow \text{BaSO}_4 (s) \)
2. **NaC₂H₃O₂ or KSCN:**
- **Test:** Add ferric chloride (FeCl₃) to the solution.
- **Observation:** Formation of a blood-red solution indicates the presence of potassium thiocyanate (KSCN) due to the formation of iron(III) thiocyanate.
- **Net Ionic Equation:**
\( \text{Fe}^{3+} (aq) + \text{SCN}^- (aq) \rightarrow \text{Fe(SCN)}^{2+} (aq) \)
3. **ZnS or CuS:**
- **Test:** Add hydrochloric acid (HCl).
- **Observation:** If the sample dissolves to form a clear solution, it indicates the presence of ZnS. CuS will not dissolve in dilute HCl.
- **Net Ionic Equation:**
\( \text{ZnS} (s) + 2 \text{H}^+ (aq) \rightarrow \text{Zn}^{2+} (aq) + \text{H}_2\text{S} (g) \)
4. **AgCl or Ag₂O:**
- **Test:** Add ammonia (NH₃) to the solution.
- **Observation:** Silver chloride (AgCl) will dissolve in excess ammonia, forming a colorless complex. Ag₂O will not dissolve readily.
- **Net Ionic Equation:**
\( \text{AgCl} (s) +
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