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Ch 15/16 Water and its Properties. Test Review

Ch 15/16 Water and its Properties. Test Review. Aqueous solution – water w/ dissolved particles (aq) Solvent – water (dissolver) Solute – salt (dissolvee) (NEW WORD?).

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Ch 15/16 Water and its Properties. Test Review

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  1. Ch 15/16 Water and its Properties. Test Review

  2. Aqueous solution – water w/ dissolved particles (aq)Solvent – water (dissolver)Solute – salt (dissolvee)(NEW WORD?)

  3. Solvation: a solute dissolves or dissociates into ions(happens with most soluble ionic compounds and acids)Electrolyte: will conduct electricity when dissolved in a liquid.3 ways to speed up solvationHeatingStirring (agitation)Increasing surface area of the solute (powder)

  4. Solubility – g of solute per 100g of solvent at a certain temperatureBelow: 2 different liquids, same amount of solute (dye). Note black bars.

  5. Does solubility change with temperature?Temperature Increase meansSolubility increases

  6. saturated solution- will dissolve no more solute (at that temperature). Excess usually makes a pile of crystals on the bottom.unsaturated solution – will dissolve more solute (at that temperature)(left 3 beakers on next slide)

  7. Dilute vs concentrated As you add more solute, from left to right  Dilute More Concentrated Saturated Saturated Since 3 on right are saturated, keep adding solute, but they don’t get darker. No more dissolves into them.

  8. Supersaturated solution – contains more solute then should be dissolved at a temperatureex…heating then cooling a solution

  9. Supersatured videos http://www.youtube.com/watch?v=XSGvy2FPfCw http://www.youtube.com/watch?v=HnSg2cl09PI 3 min Long one if you have extra time: http://www.youtube.com/watch?v=1y3bKIOkcmk

  10. New Subject: Gas Solubility: S1 = S2 P1 P2 Called Henry’s Law. Amount of gas dissolved in a liquid. Solubility of a gas in a liquid is directly related to pressure.

  11. Gas Solubility: Also, as temperature increases, more gas will dissolve into the liquid. Temp Increase means Solubility increases

  12. Miscible – liquids dissolve in each other. (liquids that can mix together)Immiscible – Guess?Is this lava lamp miscible or immiscible?

  13. Molarity: M = mol ÷ L (of solution) molality: m = moles of Solute Pg 538 kg of solventn = molesConcentrations (Note case of M / m) Molarity: M = Volume based of SOLUTION! (after mix) molality: m = Mass based of SOLVENT! (before mix)Solute + Solvent = Solution

  14. By adding water you can dilute the molarityM1V1=M2V2When you ADD WATER, moles of solute stays the same.

  15. A change in a property of a solvent that depends on the concentration of dissolved solute(s) particles is called a colligative property. Colligative properties are vapor pressure lowering, boiling point elevation, freezing point loweringNumber of solute particles in a solution determines colligative properties.

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