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A solution contains Cr^3+ ion and Mg^2+ ion. The addition of 1.00 L of 1.55 M NaF solution is...

Question:

A solution contains Cr^3+ ion and Mg^2+ ion. The addition of 1.00 L of 1.55 M NaF solution is required to cause the complete precipitation of these ions as CrF_3(s) and MgF_2(s). The total mass of the precipitate is 49.8 g . Find the mass of Cr^3+ in the original solution.

Two Variables, Two Equation Problems

To solve a system of linear equations with two variables there must be two equations. Each equation should contain both of the unknown variables. By doing this one of the variables can be expressed in terms of the other and used to solve for the identity of that variable.

Answer and Explanation: 1

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The number of moles of F that was added to the solution was {eq}1.00 L* 1.55 M = 1.55 moles {/eq}

The precipitation of {eq}CrF_3 {/eq} and...

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Solving a System of Equations with Two Unknowns

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Chapter 8 / Lesson 8
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When there are two unknowns presented in a mathematical problem, the system of equations model can be used to solve for both. Through practice, learn how to use the substitution and elimination practices to solve systems of equations for two unknown variables.


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