Solubility & rate of dissolving

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Powerpoint slides on solubility & factors affecting the rate of dissolving.

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Solubility & rate of dissolving

  1. 1. Lesson Outline <ul><li>To investigate the factors affecting the solubility of substances </li></ul><ul><li>To investigate the rate of dissolving of substances </li></ul><ul><li>Quiz </li></ul>
  2. 2. Factors Affecting the Solubility of Substances Solubility = maximum amount of a solute which can dissolve in 100 g of solvent at a fixed temperature For example: 200 g of salt in 100 g of water at 30 °C Definition:
  3. 3. <ul><li>Factors affecting the solubility of a solute in a solvent: </li></ul><ul><li>nature of the solute </li></ul><ul><li>nature of the solvent </li></ul><ul><li>temperature of the solution </li></ul>Solubility of solids and liquids when temperature Solubility of gases when temperature
  4. 4. Factors Affecting the Rate of Dissolving of Substances Rate of dissolving = time taken for solute to completely dissolve when it is added to a fixed amount of solvent Definition:
  5. 5. Faster rate of dissolving 85 °C 15 °C Faster rate of dissolving <ul><li>Factors affecting the rate of dissolving a solute in a given volume of solvent: </li></ul><ul><li>surface area of the solute </li></ul><ul><li>temperature of the solution </li></ul><ul><li>rate of stirring </li></ul>
  6. 6. Applications at Home and in the Industry Many substances that we use are in the form of solutes, solvents and solutions. Hence, it is important to know about factors affecting the solubility and rate of dissolving of substances At home : washing machine uses hot water and rotating drum to increase the solubility and rate of dissolving of detergent in water In fizzy drinks industry : Temperature of water, Solubility and rate of dissolving extracts BUT, Temperature of water, Solubility and rate of dissolving of carbon dioxide gas

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