교과서 질문
A KCl solution containing 38 g of KCl per 100.0 g of water is cooled from 60 °C to 0 °C. What happens during cooling? (Use Figure 14.11.)
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14. Solutions
Types of Aqueous Solutions
객관식
Which of the following types of aqueous solutions is formed when salt (such as NaCl) is dissolved in water?
A
Suspension
B
Electrolyte solution
C
Nonelectrolyte solution
D
Colloidal solution
검증된 단계별 안내1
Step 1: Understand the nature of salt (NaCl) when dissolved in water. NaCl is an ionic compound composed of Na⁺ and Cl⁻ ions.
Step 2: When NaCl dissolves in water, it dissociates completely into its constituent ions, Na⁺ and Cl⁻, which are free to move in the solution.
Step 3: Because the solution contains free ions that can conduct electricity, the solution is classified as an electrolyte solution.
Step 4: Differentiate this from other types of solutions: a suspension contains large particles that settle out, a colloidal solution contains particles that are intermediate in size and do not settle, and a nonelectrolyte solution contains molecules that do not dissociate into ions and thus do not conduct electricity.
Step 5: Conclude that since NaCl dissociates into ions and conducts electricity, the aqueous solution formed is an electrolyte solution.
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