Solutions in Chemistry for Class 12 CBSE Boards
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Questions and Answers

What distinguishes homogeneous solutions from heterogeneous solutions?

  • Heterogeneous solutions contain a single solute dissolved in a single solvent.
  • Homogeneous solutions have uniform distribution throughout at the microscopic level. (correct)
  • Homogeneous solutions contain multiple solutes dissolved in a single solvent.
  • Heterogeneous solutions have uniform distribution throughout at the microscopic level.
  • Which of the following is a preferred method for expressing the concentration of a solution?

  • Molarity and Molality (correct)
  • Molarity and Volume fraction
  • Mass percentage and Volume fraction
  • Molality and Mass percentage
  • If saltwater is considered a homogeneous solution, what type of solution would sand in water be classified as?

  • Dilute solution
  • Homogeneous solution
  • Heterogeneous mixture (correct)
  • Saturated solution
  • How does concentration relate to the amount of solute in a solution?

    <p>Concentration measures how much solute is present per unit volume of solution.</p> Signup and view all the answers

    Why are molarity and molality preferred over mass percentage and volume fraction for expressing concentration?

    <p>Molarity and molality take into account the number of particles in the solution.</p> Signup and view all the answers

    What is the main difference between molarity and molality?

    <p>Molarity is based on moles of solute per liter of solution, while molality is based on moles of solute per kilogram of solvent.</p> Signup and view all the answers

    Which type of properties in solutions depend solely on the number of solute particles present?

    <p>Colligative properties</p> Signup and view all the answers

    What method involves measuring the amount of reactant needed to reach an exact endpoint to determine the concentration of an unknown solution?

    <p>Titration</p> Signup and view all the answers

    How does Le Chatelier's principle relate to solubility?

    <p>Decrease in solubility can occur due to the formation of less soluble compounds.</p> Signup and view all the answers

    What does solubility refer to in a solution?

    <p>The maximum concentration of solute that can be dissolved in a given amount of solvent.</p> Signup and view all the answers

    Study Notes

    Solutions in Chemistry for Class 12th CBSE Boards

    As you delve into advanced chemistry concepts, understanding solutions becomes increasingly crucial. This article will guide you through various aspects related to solutions in your CBSE Class 12 syllabus: types of solutions, their concentrations, colligative properties, methods of preparing them, and factors affecting solubility. Let's dive right in!

    Types of Solutions

    A solution is defined as a homogeneous mixture containing one or more solutes dissolved in a single solvent. There are two main categories of solutions based on their composition: homogenous and heterogenous. Homogenous solutions have uniform distribution throughout at the microscopic level, while heterogenous solutions do not. For example, saltwater is an homogeneous solution, whereas sand in water would form a heterogeneous mixture. In this course, we focus primarily on homogenous solutions.

    Concentration of Solutions

    Concentration refers to how much solute is present per unit volume of solution. It can be expressed using different scales such as molarity, molality, mass percentage, and volume fraction. Molarity and molality are preferred because they account for the number of particles rather than just weight or volume.

    [ \text{Molarity} = \frac{\text{moles of solute}}{\text{liters of solution}} ] [ \text{Molality} = \frac{\text{moles of solute}}{\text{kilograms of solvent}} ]

    Colligative Properties

    Colligative properties are unique physical properties of solutions that depend solely upon the number of solute particles—they don’t reveal any information regarding the identity or nature of those solute particles. Examples include vapor pressure lowering, boiling point elevation, freezing point depression, and osmotic pressure. These properties help us understand and predict changes in chemical systems without needing extensive knowledge about specific solute-solvent interactions.

    Preparation of Solutions

    Various techniques exist for making solutions with desired compositions. Commonly used methods include crystallization, filtration, evaporation, and distillation. A less common method called titration, involves measuring the amount of reactant required to reach a precise end point, thereby determining the concentration of the unknown solution.

    Solubility

    Solubility refers to the maximum concentration of solute that can be dissolved in a given amount of solvent at specified temperature and pressure conditions. Factors influencing solubility include particle size, temperature, impurities, and formation of complexes or precipitates. Le Chatelier's principle suggests that mixing insoluble substances may result in the production of new products. At times, it might lead to a decrease in solubility due to the formation of less soluble compounds.

    Remember, all these ideas connect back to the central theme of solutions as fundamental building blocks in chemistry. As you continue exploring these topics, you'll find numerous real-world applications, ranging from pharmaceuticals and food science to environmental conservation efforts.

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    Explore the comprehensive guide to solutions in Chemistry for Class 12 CBSE Boards. Learn about types of solutions, concentration measurements, colligative properties, solution preparation techniques, and factors influencing solubility. Dive deep into these fundamental concepts that serve as the building blocks of advanced chemistry studies.

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