Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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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.
Transcribed Image Text:**Title: Calculating the Concentration of a Calcium Bromide Solution**
*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.*
**Calculation Steps:**
1. Convert the measured amount of calcium bromide from µmol to mmol.
- 1 µmol = 0.001 mmol
- Therefore, 30.2 µmol = 30.2 x 0.001 mmol = 0.0302 mmol
2. Convert the volume of the solution from mL to L.
- 1 mL = 0.001 L
- Therefore, 300 mL = 300 x 0.001 L = 0.300 L
3. Calculate the concentration in mmol/L.
- Concentration (in mmol/L) = Amount of substance (in mmol) / Volume of solution (in L)
- Concentration = 0.0302 mmol / 0.300 L = 0.10067 mmol/L
4. Round the answer to 3 significant digits:
- 0.10067 mmol/L rounds to 0.101 mmol/L
**Concentration of the solution: 0.101 mmol/L**
**Explanation:**
- **Unit Conversion:** The key to solving this problem effectively lies in converting units correctly between µmol, mmol, and mL, L.
- **Concentration Calculation:** This involves dividing the amount of substance by the volume of the solution to find the concentration.
**Input Box Figure:**
- The figure displays an input box asking for the concentration in mmol/L.
- There is also a calculator icon, a graph icon, and an array icon on the right-hand side for further interactive functionality.
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