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Solubility

Solubility. Solubility. Ability of one substance to dissolve in another at a given temp and pressure Usually measured as mass (g) of solute in 100g H 2 O at a given temp Saturated- max amount of solute at a given temp If more solute is added, it will not dissolve

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Solubility

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  1. Solubility

  2. Solubility • Ability of one substance to dissolve in another at a given temp and pressure • Usually measured as mass (g) of solute in 100g H2O at a given temp • Saturated- max amount of solute at a given temp • If more solute is added, it will not dissolve • Unsaturated- less than max amount of solute at a given temp • If more solute is added it will dissolve up to the point of saturation • Supersaturated – more than max amount of solute at a given temp • Saturated solution made at a higher temp then cooled. The solute remains dissolved in the solution. • Example: Sweet Tea

  3. Supersaturated Solutions • Saturated solution made at a higher temp then cooled. The solute remains dissolved in the solution. • Often if disturbed or if additional crystals (seed crystals) are added recrystallization of solute will occur • The amount of solute that recrystallizes is the amount above the saturation point for the new temp • Example: rock candy • Not all solutions can become supersaturated • When cooled recrystallization occurs as the solution cools

  4. Solubility Curves • Lines show saturation for that substance in 100g H2O at various temps • Points above line supersaturated • Points below line unsaturated

  5. What is the solubility of NaClO3 at 40⁰C?If a solution at 60 ⁰C contains 110g KBr is it US, S, or SS? If a saturated solution of KNO3 at 80 ⁰C was cooled to 20 ⁰C, what mass of crystals would form? How many g NaCl would be dissolved 300mL of a saturated at 60 ⁰C?

  6. Substances Needed for HW • ammonia- NH3 • sodium nitrate – NaNO3 • potassium chloride- KCl • potassium chlorate- KClO3 • potassium nitrate – KNO3

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