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Is it easier to dissolve sugar in hot tea, or cold tea? Why do you think this is?

Setup Cornell Notes, Titled: “Solutions and Solubility”. Is it easier to dissolve sugar in hot tea, or cold tea? Why do you think this is? What does it mean, to “dissolve”?. Solutions and Solubility. 5-10-11 Cornell Notes Guided WS. Key Definitions.

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Is it easier to dissolve sugar in hot tea, or cold tea? Why do you think this is?

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  1. Setup Cornell Notes, Titled: “Solutions and Solubility” Is it easier to dissolve sugar in hot tea, or cold tea? Why do you think this is? What does it mean, to “dissolve”?

  2. Solutions and Solubility 5-10-11 Cornell Notes Guided WS

  3. Key Definitions Solution - a uniform mixture that contains one substance dissolved in another substance Dissolve- to cause to disappear or vanish Solvent - The substance that dissolves the solute in a solution. Also, the most plentiful substance in a solution. Solutes - One or more substances dissolved in a solution. SOLVENT SOLUTE

  4. What happens when something dissolves? Particles of a solute become surrounded by particles of a solvent

  5. Solubility The ability of a solute to dissolve in a solvent. MORE COLLISIONS BETWEEN SOLVENT AND SOLUTE = HIGHER SOLUBILITY

  6. Factors that affect solubility: How do we dissolve things? MORE COLLISIONS BETWEEN SOLVENT AND SOLUTE = HIGHER SOLUBILITY • Agitation: shaking or mixing • Surface area: the amount of substance touching the solvent • Temperature: makes molecules move

  7. Levels of Saturation How much solute is dissolved in a solution • Unsaturated: if you were to add more solute, it would still dissolve • Saturated: you have dissolved all the solute you can • Supersaturated: There is more solute dissolved than is possible (it starts precipitating back into a solid)

  8. Common terms • Concentrated – strong, lots of solute compared to solvent • Diluted – weak, very little solute compared to solvent

  9. Solubility Curve • A picture of how soluble a compound is • Solubility vs. Temperature: Measures how much solute dissolves in 100 mL of water at different temperatures Solubility (g solute in 100 mL of H2O) Maximum amount of solute that can dissolve in the solvent at that temperature Temperature (˚C)

  10. What can we do with a solubility curve? 1: Identify which compounds are more soluble at a specific temperature The higher the curve, the more soluble! At 100˚C, which is more soluble: KBr or NaCl? KBr is more soluble!

  11. What can we do with a solubility curve? 2. We can determine the level of saturation! Points where a solution is SATURATED SUPERSATURATED Above the curve Solubility (g solute in 100 mL of H2O) UNSATURATED Below the curve Temperature (˚C)

  12. Example SUPERSATURATED If we dissolve 100 g of KNO3 in 100 mL of water at 30˚C, what is the level of saturation of the solution?

  13. What can we do with a solubility curve? 3. Determine how much solute can dissolve in a solution at a specific temperature At 60˚C, how many grams of KNO3 can we dissolve in 100 mL of water? 100 g of KNO3 can be dissolved!

  14. What would happen if we dissolved 100g of KNO3 to saturation at 60°C, then lower the temperature to 20°C?

  15. Start Worksheet!

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