A chemist prepares a solution of calcium bromide (CaBr,) by measuring out 17. g of calcium bromide into a 250. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's calcium bromide solution. Be sure your answer has the correct number of significant digits.
A chemist prepares a solution of calcium bromide (CaBr,) by measuring out 17. g of calcium bromide into a 250. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's calcium bromide solution. Be sure your answer has the correct number of significant digits.
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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![### Calculation of Calcium Bromide Solution Concentration
A chemist prepares a solution of calcium bromide \((\text{CaBr}_2)\) by measuring out 17.0 g of calcium bromide into a 250 mL volumetric flask and filling the flask to the mark with water.
Calculate the concentration in mol/L of the chemist's calcium bromide solution. Be sure your answer has the correct number of significant digits.
**Answer Input:**
- A box to input the concentration in mol/L.
- Additional tools for calculation and help, such as a question mark icon for assistance.
### Instructions:
1. **Determine the Molar Mass of Calcium Bromide (\(\text{CaBr}_2\)):**
- Calculate using the periodic table values for calcium (\(\text{Ca}\)) and bromine (\(\text{Br}\)).
2. **Calculate the Number of Moles:**
- Use the formula:
\[
\text{moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}}
\]
3. **Determine the Molarity (Concentration in mol/L):**
- Use the formula:
\[
\text{molarity (mol/L)} = \frac{\text{moles of solute}}{\text{volume of solution (L)}}
\]
- Convert 250 mL to L by dividing by 1000.
4. **Significant Figures:**
- Ensure the final answer reflects the correct number of significant digits based on the given data.
### Tools:
- **Check Button:** To verify the answer.
- **Save For Later:** To store progress.
### Legal Notice:
© 2020 McGraw-Hill Education. All Rights Reserved. Terms of Use | Privacy Policy](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd6b4b3c2-4046-4191-924e-940642767ef5%2Fef79d911-048c-4d30-b99a-99f9257c44eb%2F1zcfca_processed.jpeg&w=3840&q=75)
Transcribed Image Text:### Calculation of Calcium Bromide Solution Concentration
A chemist prepares a solution of calcium bromide \((\text{CaBr}_2)\) by measuring out 17.0 g of calcium bromide into a 250 mL volumetric flask and filling the flask to the mark with water.
Calculate the concentration in mol/L of the chemist's calcium bromide solution. Be sure your answer has the correct number of significant digits.
**Answer Input:**
- A box to input the concentration in mol/L.
- Additional tools for calculation and help, such as a question mark icon for assistance.
### Instructions:
1. **Determine the Molar Mass of Calcium Bromide (\(\text{CaBr}_2\)):**
- Calculate using the periodic table values for calcium (\(\text{Ca}\)) and bromine (\(\text{Br}\)).
2. **Calculate the Number of Moles:**
- Use the formula:
\[
\text{moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}}
\]
3. **Determine the Molarity (Concentration in mol/L):**
- Use the formula:
\[
\text{molarity (mol/L)} = \frac{\text{moles of solute}}{\text{volume of solution (L)}}
\]
- Convert 250 mL to L by dividing by 1000.
4. **Significant Figures:**
- Ensure the final answer reflects the correct number of significant digits based on the given data.
### Tools:
- **Check Button:** To verify the answer.
- **Save For Later:** To store progress.
### Legal Notice:
© 2020 McGraw-Hill Education. All Rights Reserved. Terms of Use | Privacy Policy
![**Title: Preparing an Aqueous Potassium Dichromate Solution**
**Task:**
A chemist must prepare 550. mL of 60.0 mM aqueous potassium dichromate \((K_2Cr_2O_7)\) working solution. The chemist achieves this by pouring out a specific volume of 0.403 mol/L aqueous potassium dichromate stock solution into a graduated cylinder and diluting it with distilled water.
**Problem:**
Calculate the volume in mL of the potassium dichromate stock solution that the chemist should pour out. Ensure your answer has the correct number of significant digits.
**Interactive Elements:**
- Input box labeled "mL" for the student to enter their calculated volume.
- Functions to clear the input, undo entries, and request hints.
**Notes:**
Ensure calculations are accurate and check for significant figures. Use the equation for dilution:
\[
C_1V_1 = C_2V_2
\]
where \(C_1\) and \(V_1\) are the concentration and volume of the stock solution, respectively, and \(C_2\) and \(V_2\) are the desired concentration and volume of the working solution.
**Options:**
- **Check Button:** Submit your answer.
- **Save For Later:** Save your progress to continue later.
- **Submit Assignment:** Finalize your solution and complete the submission.
*(No graphs or diagrams are included in this task.)*](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd6b4b3c2-4046-4191-924e-940642767ef5%2Fef79d911-048c-4d30-b99a-99f9257c44eb%2F2fjq04_processed.jpeg&w=3840&q=75)
Transcribed Image Text:**Title: Preparing an Aqueous Potassium Dichromate Solution**
**Task:**
A chemist must prepare 550. mL of 60.0 mM aqueous potassium dichromate \((K_2Cr_2O_7)\) working solution. The chemist achieves this by pouring out a specific volume of 0.403 mol/L aqueous potassium dichromate stock solution into a graduated cylinder and diluting it with distilled water.
**Problem:**
Calculate the volume in mL of the potassium dichromate stock solution that the chemist should pour out. Ensure your answer has the correct number of significant digits.
**Interactive Elements:**
- Input box labeled "mL" for the student to enter their calculated volume.
- Functions to clear the input, undo entries, and request hints.
**Notes:**
Ensure calculations are accurate and check for significant figures. Use the equation for dilution:
\[
C_1V_1 = C_2V_2
\]
where \(C_1\) and \(V_1\) are the concentration and volume of the stock solution, respectively, and \(C_2\) and \(V_2\) are the desired concentration and volume of the working solution.
**Options:**
- **Check Button:** Submit your answer.
- **Save For Later:** Save your progress to continue later.
- **Submit Assignment:** Finalize your solution and complete the submission.
*(No graphs or diagrams are included in this task.)*
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