### Calculating Ion Molarity Using Solute Mass**Chemical Reactions**A chemist prepares a solution of magnesium bromide (\( \text{MgBr}_2 \)) by measuring out 2.1 g of \( \text{MgBr}_2 \) into a 300 mL volumetric flask and filling to the mark with distilled water.Calculate the molarity of \( \text{Br}^- \) anions in the chemist’s solution.Be sure your answer is rounded to the correct number of significant digits.**Calculation Fields:**- Mol: _____- L: _____**Buttons:**- Explanation- Check© 2022 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center | Accessibility

For MgBr2 solution , the molarity of Mg2+ is same with MgBr2 and Br- will be double than the molarity of MgBr2. Because the dissociation of MgBr2 is as follows; MgBr2 ---> Mg2+ + 2Br- Now , Molarity is the moles of solute present per 1L or per 1000 mL solution. Molar mass of MgBr2 = 24.3(for Mg) + 2×79.9(for Br ) = 184.1 g/mol So, 2.1 g MgBr2 = 2.1g/(184.1g/mol) = 0.0114 mole of MgBr2 . So, In 300 mL solution 0.0114 mole MgBr2 is present in 1 mL solution (0.0114/300) mole MgBr2 will present . in 1000 mL solution (0.0114/300)×1000 = 0.038 mole So, in 1000 mL or 1L solution 0.038 moles of MgBr2 is present . So, molarity = 0.038 mole/L.

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Calculating ion molarity using solute mass A chemist prepares a solution of magnesium bromide (MgBr₂) by measuring out 2.1 g of MgBr₂ into a 300. mL volumetric flask and filling to the mark with distilled water. Calculate the molarity of Br anions in the chemist's solution. Be sure your answer is rounded to the correct number of significant digits. 0 mol L 3 da 4 199

Calculating ion molarity using solute mass A chemist prepares a solution of magnesium bromide (MgBr₂) by measuring out 2.1 g of MgBr₂ into a 300. mL volumetric flask and filling to the mark with distilled water. Calculate the molarity of Br anions in the chemist's solution. Be sure your answer is rounded to the correct number of significant digits. 0 mol L 3 da 4 199

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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