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When NaCl is added to aqueous solution o...

When NaCl is added to aqueous solution of glucose

A

Freezing point is lowered

B

Freezing point is raised

C

Freezing point does not change

D

Variation is freezing point can't be predicted

Text Solution

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The correct Answer is:
To solve the question "When NaCl is added to an aqueous solution of glucose," we need to analyze the effects of adding NaCl (sodium chloride) to the glucose solution. Here’s a step-by-step breakdown of the solution: ### Step 1: Understand the Components - We have an aqueous solution of glucose, which is a non-electrolyte and does not dissociate into ions in solution. - When NaCl is added to this solution, it dissociates into its constituent ions: Na⁺ and Cl⁻. **Hint:** Remember that glucose is a non-electrolyte, while NaCl is an electrolyte that dissociates in solution. ### Step 2: Effect of Dissociation on Freezing Point - The dissociation of NaCl introduces ions into the solution. The presence of these ions affects the colligative properties of the solution, specifically the freezing point. - The van 't Hoff factor (i) for NaCl is 2 because it dissociates into two ions (Na⁺ and Cl⁻). **Hint:** The van 't Hoff factor (i) is crucial for understanding how solutes affect colligative properties. ### Step 3: Colligative Properties and Freezing Point Depression - The freezing point depression (ΔTf) can be calculated using the formula: \[ \Delta Tf = i \cdot K_f \cdot m \] where: - \(i\) = van 't Hoff factor - \(K_f\) = cryoscopic constant of the solvent (water in this case) - \(m\) = molality of the solution **Hint:** The more particles (ions) present in the solution, the greater the effect on the freezing point. ### Step 4: Conclusion on Freezing Point Change - Since the addition of NaCl increases the number of particles in the solution (due to dissociation), both \(i\) and \(m\) increase. - This results in an increase in the value of ΔTf, meaning the freezing point of the solution will be lowered. **Hint:** An increase in ΔTf indicates a decrease in the freezing point. ### Final Answer When NaCl is added to an aqueous solution of glucose, the freezing point of the solution is lowered. **Answer:** A. The freezing point is lowered.
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