9th class chemistry chapter 6 notes

Important Notes of 9th class chemistry chapter 6 notes Urdu Medium written by Honorable Sir M. Shahid Suib. These notes are very helpful in the preparation of Solutions Class 9 Chemistry for students of the 9th class chemistry chapter 6 notes Urdu Medium and these are according to the paper patterns of all Punjab boards.

Summary and Contents:
Topics which are discussed in the notes are given below:
  • Complete Exercise MCQs of Chapter No.6: Solutions in Urdu Medium
  • Complete Exercise Short Questions with Answers of Chapter No.6: Solutions in Urdu Medium
  • Major Concepts: Solution, aqueous solution, solute and solvent, Saturated, unsaturated, supersaturated solutions and dilution of solution, Types of solutions, Concentration units, Comparison of solutions, suspensions and colloids
  • SOLUTION: A solution is a homogeneous mixture of two or more substances. The boundaries of the components can't be distiguished i.e. a solution exist as one phase. For example, the air we breathe is a solution of several gases, brass is a solid solution of Zn and Cu.  Sugar dissolved in water is an example of liquid solution.
  • Aqueous Solutions: The solution which is formed by dissolving a substance in water is called an aqueous solution.
  • Solute: The component of solution which is present in smaller quantity is called solute. A solute is dissolved in a solvent to make a solution.
  • Solvent: The component of a solution which is present in larger quantity is called solvent. Solvent always dissolves solutes. In a solution, if more than two substances are present, one substance acts as solvent and others behave as solutes.
  • SATURATED SOLUTION: When a small amount of solute is added in a solvent, solute dissolves very easily in the solvent. If the addition of solute is kept on, a stage is reached when solvent cannot dissolve any more solute.
  • A solution containing maximum amount of solute at a given temperature is called saturated solution.
  • Unsaturated Solution: A solution which contains lesser amount of solute than that which is required to saturate it at a given temperature, is called unsaturated solution. Such solutions have the capacity to dissolve more solute to become a saturated solution.
  • Supersaturated Solution: When saturated solutions are heated, they develop further capacity to dissolve more solute. Such solutions contain greater amount of solute than is required to form a saturated solution and they become more concentrated. The solution that is more concentrated than a saturated solution is known as supersaturated solution.
  • Dilution of Solution: The solutions are classified as dilute or concentrated on the basis of relative amount of solute present in them. Dilute solutions are those which contain relatively small amount of dissolved solute in the solution. Concentrated solutions are those which contain relatively large amount of dissolved solute in the solution.
  • TYPES OF SOLUTION: Each solution consists of two components, solute and solvent. The solute as well as solvent may exist as gas, liquid or solid. So, depending upon the nature of solute and solvent different types of solutions.
  • CONCENTRATION UNITS: Concentration is the proportion of a solute in a solution. It is also a ratio of the amount of solute to the amount of solution or ratio of amount of solute to the amount of the solvent. Please keep in mind that concentration does not depend upon the total volume or total amount of the solution.
  • Percentage: Percentage unit of concentration refers to the percentage of solute present in a solution. The percentage of solute can be expressed by mass or by volume.
  • Percentage - mass/mass (%m/m)
  • Percentage - mass/volume (%m/v)
  • Percentage - volume/mass (%v/m)
  • Percentage - volume /volume (% v/v)
  • Molarity: It is a concentration unit defined as number of moles of solute dissolved in one dm3^ of the solution. It is represented by M. Molarity is the unit mostly used in chemistry and allied sciences.
  • Preparation of Molar Solution: One Molar solution is prepared by dissolving 1 mole (molar mass) of the solute in sufficient amount of water to make the total volume of the solution up to 1 dm^3 in a measuring flask. For example, 1M solution of NaOH is prepared by dissolving 40 g of 3 NaOH in sufficient water to make the total volume 1 dm^3.
  • Important MCQs and Questions of Solutions:

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