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Ch.5 - Introduction to Solutions and Aqueous Solutions
All textbooksTro 5th EditionCh.5 - Introduction to Solutions and Aqueous SolutionsProblem 40
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Chapter 5, Problem 40

Classify each compound as a strong electrolyte or nonelectrolyte. a. MgBr2 b. C12H22O11 c. Na2CO3 d. KOH

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Identify the type of compound: ionic or covalent. Ionic compounds typically dissociate into ions in solution, making them strong electrolytes.
For compound (a) MgBr<sub>2</sub>: Recognize that it is an ionic compound composed of Mg<sup>2+</sup> and Br<sup>-</sup> ions. Ionic compounds like this are strong electrolytes because they dissociate completely in water.
For compound (b) C<sub>12</sub>H<sub>22</sub>O<sub>11</sub>: Recognize that it is a covalent compound (sucrose, a sugar). Covalent compounds generally do not dissociate into ions in solution, making them nonelectrolytes.
For compound (c) Na<sub>2</sub>CO<sub>3</sub>: Recognize that it is an ionic compound composed of Na<sup>+</sup> and CO<sub>3</sub><sup>2-</sup> ions. Ionic compounds like this are strong electrolytes because they dissociate completely in water.
For compound (d) KOH: Recognize that it is an ionic compound composed of K<sup>+</sup> and OH<sup>-</sup> ions. It is a strong base and dissociates completely in water, making it a strong electrolyte.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Electrolytes

Electrolytes are substances that dissociate into ions when dissolved in water, allowing the solution to conduct electricity. They can be classified as strong electrolytes, which completely ionize in solution, or weak electrolytes, which only partially ionize. Understanding the behavior of electrolytes is crucial for predicting the conductivity of solutions.
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Strong Electrolytes

Strong electrolytes are compounds that fully dissociate into their constituent ions in an aqueous solution. Common examples include soluble salts like sodium chloride (NaCl) and strong bases like potassium hydroxide (KOH). Identifying strong electrolytes is essential for classifying compounds based on their ability to conduct electricity in solution.
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Nonelectrolytes

Nonelectrolytes are substances that do not dissociate into ions in solution and therefore do not conduct electricity. Examples include sugars like sucrose (C12H22O11) and alcohols. Recognizing nonelectrolytes is important for understanding the properties of solutions and their behavior in chemical reactions.
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