Mixtures/solutions/solubilty 💧

• What are the learning objectives of the solutions section?

  To describe solutions using key words and explain how substances dissolve using the particle model.
• What does the mass of a sugar solution equal?

  The mass of the sugar solution equals the total mass of sugar and water combined.
• If Sarah dissols 3 g of copper sulfate in 100 g of water, what is the mass of the solution?

  The mass of the solution is 103 g.
• What is a solution?

  A solution is a mixture of a liquid with a solid or gas where all parts are the same and separate substances cannot be seen.
• What happens to sugar when it dissolves in water?

  The sugar particles mix with the liquid and are surrounded by water particles.
• What is the role of water in a sugar solution?

  Water is the solvent in a sugar solution.
• Can you see sugar in a solution?

  No, you cannot see sugar in a solution, but you can taste it.
• What color is coffee solution?

  Coffee solution is brown and cloudy.
• How can mass be used to determine if something is dissolved?

  You can compare the mass of pure water with the mass of the solution to see if a substance is dissolved.
• What is the mass of one liter of pure water?

  The mass of one liter of pure water is 1000 g.
• What is a saturated solution?

  A saturated solution contains the maximum mass of a substance that will dissolve, with some undissolved substance present.
• How much sodium chloride can be dissolved in 100 g of water to make a saturated solution?

  Just over 36 g of sodium chloride can be dissolved in 100 g of water.
• What is solubility?

  Solubility is the maximum mass of solute that dissolves in 100 g of water.
• What is one of the most soluble salts?

  Potassium nitrate is one of the most soluble salts.
• What happens to the solubility of most substances as temperature increases?

  Most substances become more soluble as temperature increases.
• How does temperature affect the dissolving of sugar?

  You can dissolve more sugar in hot water than in cold water.
• What are examples of insoluble substances in water?

  Chalk (calcium carbonate) and sand (silicon dioxide) are insoluble in water.
• What is the process of dissolving in a solution?

  • A solute is mixed with a solvent.
  • The solute particles are surrounded by solvent particles.
  • The solute particles become evenly distributed in the solvent.
  • The solution appears uniform and clear.
• What are the key terms related to solutions and solubility?

  • Solvent: the liquid that dissolves a solute.
  • Solute: the substance that is dissolved.
  • Solution: a homogeneous mixture of solute and solvent.
  • Saturated solution: a solution that cannot dissolve any more solute.
  • Solubility: the maximum mass of solute that can dissolve in a given mass of solvent.
• If a student adds 20 g of potassium chloride to 100 g of water, what would they observe based on solubility data?

  They would see that the potassium chloride dissolves completely if it is below its solubility limit.
• If a student adds 200 g of cerium(III) sulfate to 100 g of water, what would they observe based on solubility data?

  They would see undissolved cerium(III) sulfate at the bottom if it exceeds its solubility limit.
• What are the steps to model dissolving for primary school children?

  • Use peas and beans to represent particles.
  • Show how particles move and mix in a solution.
  • Draw diagrams to illustrate the process.
  • Explain the concept of solute and solvent using simple terms.