The Question is from neet-chemistry basic-chemistry-concepts concentration-methods, and it was created by the author A.RAMA NAGESWARARAO

Question

Which of the following concentration terms is NOT affected by temperature?

A.RAMA NAGESWARARAO · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
 **Primary Concept**: Concentration units and their temperature dependence.
 **Related Topics**: Solutions, molar mass, density.
 **Prerequisites**: Understanding of molar mass, moles, volume, and mass.
## SOLUTION PATHWAY
**Given Information**:
  The question asks which concentration term is independent of temperature.
  The options are Molality, Molarity, Normality, and Formality.
**Method & Steps**:
 1. Analyze each concentration term's definition and how it relates to temperature.
  Reasoning: Temperature affects the volume of a solution, but not its mass.  Therefore, concentration terms based on volume will be affected by temperature changes.
 2. Examine the formulas for each concentration term.
  Working:
  * **Molarity (M):** $M = \frac{moles\,of\,solute}{liters\,of\,solution}$  (Volume is temperature-dependent)
  * **Molality (m):** $m = \frac{moles\,of\,solute}{kilograms\,of\,solvent}$ (Mass is temperature-independent)
  * **Normality (N):** $N = \frac{equivalents\,of\,solute}{liters\,of\,solution}$ (Volume is temperature-dependent)
  * **Formality (F):** $F = \frac{formula\,weights\,of\,solute}{liters\,of\,solution}$ (Volume is temperature-dependent)
  Key Point: Only molality uses the mass of the solvent, which is not significantly affected by temperature changes.
 3. Identify the concentration term unaffected by temperature.
  Result: Molality (m) is the only concentration term that is not significantly affected by temperature changes.
  Verification: Since the mass of the solvent remains relatively constant with temperature changes, the molality remains relatively constant.
 ## OPTION ANALYSIS
A ✓: Molality is correct because it is defined as moles of solute per kilogram of solvent. Kilograms are a unit of mass, and mass is not affected by temperature changes.
B :x: Molarity is incorrect because it is defined as moles of solute per liter of solution. Liters (volume) are temperature-dependent.
 C :x: Normality is incorrect because it's based on equivalents of solute per liter of solution, where volume is temperature-dependent.
D :x: Formality is incorrect because it is defined as formula weights of solute per liter of solution, where volume is temperature-dependent.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing molality and molarity: Remember that molality uses mass (kg) of solvent, while molarity uses volume (L) of solution.
  2.Ignoring the temperature dependence of volume:  Always consider how temperature affects volume when dealing with concentration units involving volume.
 **Quick Tips**:
  1.Focus on the units in the definition of each concentration term to determine temperature dependence.
  2.Remember that mass is generally temperature-independent while volume is temperature-dependent.

A.RAMA NAGESWARARAO · Answer

The correct Option is "Molality"

A.RAMA NAGESWARARAO · Answer

Molarity

A.RAMA NAGESWARARAO · Answer

Normality

A.RAMA NAGESWARARAO · Answer

Formality

NEET Chemistry Some Basic Concepts in Chemistry Concentration Methods MCQs

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