Solubility

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Solubility

  1. 1. Solutions and Suspensions Solubility and Rate of Dissolving
  2. 2. Solubility <ul><li>Objectives: </li></ul><ul><li>Understand the definition of solubility. </li></ul><ul><li>Investigate the factors that affect the solubility of various substances. </li></ul><ul><li>Understand the definition of the rate of dissolving. </li></ul><ul><li>Investigate the factors that affect the rate of dissolving of substances </li></ul>
  3. 4. Solubility <ul><li>Solubility is the maximum amount of solute that can be dissolve in 100g of solvent at a given temperature </li></ul>
  4. 5. Solubility <ul><li>Example </li></ul><ul><li>What is the solubility of sugar in water at 25  C if 28g of sugar can be dissolved in 250ml of water? (mass of 1ml of water is 1g) </li></ul><ul><li>Amt of sugar in 1g of water </li></ul><ul><li>= 28 / 250 = 0.112g </li></ul><ul><li>Amt of sugar in 100g of water </li></ul><ul><li>= 0.112 x 100 = 11.2g </li></ul>Solubility of sugar in water at 25  C is 11.2g per 100g of water
  5. 6. Solubility <ul><li>Example </li></ul><ul><li>The solubility of salt in oil at room temperature is 25g. How much salt can be dissolved in 200cm 3 oil at room temperature? (density of oil is 0.9g/cm 3 ) </li></ul>Mass of 200cm 3 of oil = 0.9 x 200 = 180g
  6. 7. Solubility <ul><li>Continue… </li></ul><ul><li>Amt. of salt that can be dissolved in 200cm 3 of oil </li></ul><ul><li>= 25 x 180/100 </li></ul><ul><li>= 45g </li></ul>
  7. 8. Solubility <ul><li>Saturated Solution </li></ul><ul><li>- A solution where maximum amount of solute is dissolved in the solvent. </li></ul>A B
  8. 9. Solubility <ul><li>Factors affecting solubility: </li></ul><ul><li>Temperature </li></ul><ul><li>Nature of Solute </li></ul><ul><li>Nature of Solvent </li></ul>
  9. 10. Solubility <ul><li>The higher the temperature, the greater the solubility </li></ul>Temp/°C Solubility/ g per 100g of solvent 0 10 20 30 40 10 20
  10. 11. Solubility <ul><li>Conclusion </li></ul><ul><li>Solubility is the amount of solute that can be dissolved in 100g of solvent </li></ul><ul><li>Saturated Solution has maximum solute in the solvent. </li></ul><ul><li>Temperature, nature of solvent and solutes affect solubility </li></ul>

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