A chemist prepares a solution of calcium bromide (CaBr2) by measuring out 30.2 µmol of calcium bromide into a 300. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mmol/L of the chemist's calcium bromide solution. Round your answer to 3 significant digits.
A chemist prepares a solution of calcium bromide (CaBr2) by measuring out 30.2 µmol of calcium bromide into a 300. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mmol/L of the chemist's calcium bromide solution. Round your answer to 3 significant digits.
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter11: Solutions
Section: Chapter Questions
Problem 65AP
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A chemist prepares a solution of calcium bromide(CaBr2) by measuring our 30.2 umol of calcium bromide into a 300.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. Round your answer to 3 significant digits.
![**Chemistry Calculation: Concentration of Calcium Bromide Solution**
**Problem Statement:**
A chemist prepares a solution of calcium bromide (CaBr₂) by measuring out 30.2 μmol of calcium bromide into a 300. mL volumetric flask and filling the flask to the mark with water.
Calculate the concentration in mmol/L of the chemist's calcium bromide solution. Round your answer to 3 significant digits.
**Solution:**
To find the concentration, you need the amount of substance in moles (or millimoles) and the volume of the solution in liters.
1. **Convert micromoles to millimoles:**
\[ 30.2 \, \mu\text{mol} = \frac{30.2 \, \mu\text{mol}}{1000} = 0.0302 \, \text{mmol} \]
2. **Convert the volume from milliliters to liters:**
\[ 300. \, \text{mL} = \frac{300.}{1000} = 0.300 \, \text{L} \]
3. **Calculate the concentration in mmol/L:**
\[ \text{Concentration} = \frac{\text{Amount of substance (mmol)}}{\text{Volume (L)}} = \frac{0.0302 \, \text{mmol}}{0.300 \, \text{L}} = 0.1007 \, \text{mmol/L} \]
Rounded to 3 significant digits, the concentration is:
\[ \text{Concentration} = 0.101 \, \text{mmol/L} \]
**Answer:**
The concentration of the calcium bromide solution is \(0.101 \, \text{mmol/L}\).
**UI Elements:**
- There is a box labeled "mmol/L" where the user is expected to input their final calculated concentration.
**Action Buttons:**
- **Check**: To verify the solution.
- **Explanation**: To provide more details or steps if needed.
- Other icons at the right side include:
- A calculator icon.
- A statistics/graph icon.
- An AR (augmented reality) icon.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F27b4802f-f0fe-408d-90d1-a8d89e62e50b%2F53283d24-a3db-44b1-a2d4-c8643f963b7b%2Fo0f3pusf.jpeg&w=3840&q=75)
Transcribed Image Text:**Chemistry Calculation: Concentration of Calcium Bromide Solution**
**Problem Statement:**
A chemist prepares a solution of calcium bromide (CaBr₂) by measuring out 30.2 μmol of calcium bromide into a 300. mL volumetric flask and filling the flask to the mark with water.
Calculate the concentration in mmol/L of the chemist's calcium bromide solution. Round your answer to 3 significant digits.
**Solution:**
To find the concentration, you need the amount of substance in moles (or millimoles) and the volume of the solution in liters.
1. **Convert micromoles to millimoles:**
\[ 30.2 \, \mu\text{mol} = \frac{30.2 \, \mu\text{mol}}{1000} = 0.0302 \, \text{mmol} \]
2. **Convert the volume from milliliters to liters:**
\[ 300. \, \text{mL} = \frac{300.}{1000} = 0.300 \, \text{L} \]
3. **Calculate the concentration in mmol/L:**
\[ \text{Concentration} = \frac{\text{Amount of substance (mmol)}}{\text{Volume (L)}} = \frac{0.0302 \, \text{mmol}}{0.300 \, \text{L}} = 0.1007 \, \text{mmol/L} \]
Rounded to 3 significant digits, the concentration is:
\[ \text{Concentration} = 0.101 \, \text{mmol/L} \]
**Answer:**
The concentration of the calcium bromide solution is \(0.101 \, \text{mmol/L}\).
**UI Elements:**
- There is a box labeled "mmol/L" where the user is expected to input their final calculated concentration.
**Action Buttons:**
- **Check**: To verify the solution.
- **Explanation**: To provide more details or steps if needed.
- Other icons at the right side include:
- A calculator icon.
- A statistics/graph icon.
- An AR (augmented reality) icon.
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