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Properties of Water

Properties of Water. Hydrogen bonding. Surface tension. Ice, water, vapor. Hydrogen bonding (electric attraction). Ice. Liquid. Water-soluble protein. “Dissociation” of water. pH. [H+]= 10 -1 M. pH = – log [H+]. Log scale means 10X change per unit!. [H+]= 10 -9 M. Buffers.

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Properties of Water

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  1. Properties of Water

  2. Hydrogen bonding

  3. Surface tension

  4. Ice, water, vapor

  5. Hydrogen bonding (electric attraction) Ice Liquid

  6. Water-soluble protein

  7. “Dissociation” of water

  8. pH [H+]= 10-1M pH = – log [H+] Log scale means 10X change per unit! [H+]= 10-9 M

  9. Buffers • Buffers resist changes to the pH of a solution when H+ or OH- is added to the solution. • Buffers accept hydrogen ions from the solution when they are in excess and donate hydrogen ions when they have been depleted.

  10. Overall lessons: • Many properties of water are emergent properties due to hydrogen bonding. • The cohesion of water molecules to each other is exploited by plants and animals. • Water resists temperature changes by absorbing lots of heat. • Lower density of ice causes it to float & insulate the water below. • The polarity of water allows it to dissolve other polar molecules. • Non-polar compounds are hydrophobic and not easily dissolved in water. • A mole of a compound has a constant # of molecules. • Adding or removing hydrogen ions changes the pH of a solution. • Buffers resist pH changes by accepting or donating H ions when [H+] changes.

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