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:Certainly! Here's a transcription and explanation of the document as it might appear on an educational website:
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**Chemistry Lab Report Sheet**
**PART I: Write observations and complete molecular equations for each reaction. Identify the precipitant using the solubility chart.**
**A1:**
- **Observation:** White ppt forms.
- **Explanation:** In this reaction, \( \text{CaCO}_3 \) is insoluble in solution as per the given chart, so it is precipitated as white ppt.
- **Equation:** \( \text{Ca(NO}_3)_2 + \text{Na}_2\text{CO}_3 \rightarrow \text{CaCO}_3(s) + 2\text{NaNO}_3 \)
**A2:**
- **Observation:** White cloudy ppt forms.
- **Explanation:** In this reaction, only \( \text{Mg(OH)}_2 \) is insoluble so its cloudy ppts are formed.
- **Equation:** \( \text{MgSO}_4 + 2\text{NaOH} \rightarrow \text{Mg(OH)}_2(s) + \text{Na}_2\text{SO}_4 \)
**A3:**
- **Observation:** Solution remains clear.
- **Explanation:** In this reaction, all salts are soluble hence no change or no ppt is observed.
- **Equation:** \( \text{NaNO}_3 + \text{KCl} \rightarrow \text{KNO}_3 + \text{NaCl} \)
**B1:**
- **Observation:** Phenolphthalein is pink in presence of NaOH. It will become colorless as HCl is added.
- **Explanation:** Phenolphthalein is a pH indicator that turns pink in basic solutions and colorless in acidic solutions.
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This transcription provides a logical flow and explanation for each reaction based on the solubility of the compounds involved, useful for educational purposes.
Transcribed Image Text:In Part I (A) reactions, how did you decide what (compound) precipitated?
Expert Solution
Step 1
In each of the cases in Part I (A), the precipitated compound is predicted.
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