Chem_100L_lecture - Experiment 4:The Temperature dependence...

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Experiment 4:The Temperature dependence of Salt Solubility Solubility: Maximum amount of substance which can dissolve in 100 mL of a solvent forming a solution at a specific temperature Solute: Substance being dissolved Solvent: The liquid which the substance is being dissolved in Solute + Solvent= Solution EXAMPLE: Sugar dissolved in water Alcohol dissolved in soda CO 2 dissolves in sprite Can be solids, liquids, or gas Most solids + liquids increase in solubility at high temperature - Gases the opposite is true - Under pressure, gases become more soluble Carbonated drinks Sodas are bottled under pressure When releasing pressure by opening a soda bottle, CO 2 instantly loses its solubility and escapes. Methods to increase the rate of dissolving: 1. Stire or mix 2. Increase temperature 3. Crush it More surface area in which to interact with the solvent In this experiment Determine the solubility of salts in water at various temperatures Solids tend to be more soluble at higher temperatures Solubility is measured at a Saturation Point Point at which an insoluble precipitate forms Measurre solubility of KCl (EXPERIMENT)
1. Add 3.5g KCl + 10.0 mL water, heat to 80.0 2. If insoluble = heat to 100 3. Cool and observe this Saturation Point a. Record this at which this occurs 4.

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