What is the concentration (in millimolar) of F— ions when 33 mg of MgF2completely dissociates in 2.5 L of water?

Answered: What is the concentration (in…

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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Question

What is the concentration (in millimolar) of F^— ions when 33 mg of MgF₂completely dissociates in 2.5 L of water?

Expert Solution

Step 1

To determine the millimolar of F^-first of all, we determine the molarity of the MgF₂ solution. The number of moles of MgF₂ present in one-liter of the solution is known as the molarity of the solution. The molarity of the solution is calculated by the following formula:

Step 2

Calculation of molarity of MgF₂:

For the given solution:

Mass of solute MgF2 is = 33 mg = 33x10^-3 g

We know that the molar mass of MgF₂ is = 62.3018 g/mol

The volume of the solution is = 2.5 L

Let's put these values into the molarity formula:

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