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osmosis

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OSMOSIS

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8 Terms

1

OSMOSIS

  • net movement of solvent molecules from a high water potential (dilute) to lower water potential (concentrated) through partially permeable membrane

<ul><li><p>net movement of <mark data-color="red">solvent</mark> molecules from a <mark data-color="red">high water potential</mark> (dilute) to <mark data-color="red">lower water potential</mark> (concentrated) through <mark data-color="red">partially permeable membrane </mark></p></li></ul>
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2

SOLUTE

  • solid that can dissolve

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3

SOLVENT

  • liquid that solute dissolves in

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4

SOLUTION

  • solute dissolved in solvent

  • CONCENTRATED SOLUTION:lots of solute per volume of solvent (high g/L)

  • DILUTE SOLUTION:less solute per volume of solvent (low g/L)

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5

DISSOLVING

  • when solute breaks up from a larger crystal of molecules into much smaller groups or individual molecules- caused by coming into contact with solvent

  • solvent molecules then attracted to water molecules when substance dissolves

<ul><li><p>when <mark data-color="purple">solute</mark> breaks up from a larger crystal of molecules into much smaller groups or individual molecules- caused by coming into contact with <mark data-color="purple">solvent</mark></p></li></ul><p></p><ul><li><p><mark data-color="purple">solvent</mark> molecules then attracted to <mark data-color="purple">water</mark> molecules when substance <mark data-color="purple">dissolves</mark></p></li></ul>
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6

WATER POTENTIAL

  • the ability of water molecules to move out of a solution (across a membrane) by osmosis

  • water molecules are small enough to pass through a semi permeable membrane- in pure water all molecules have ability/potential to cross

  • as you dissolved a solute in water some of the water molecules are attracted to the solute molecules- these no longer have potential to cross membrane

<ul><li><p>the ability of water molecules to move out of a solution (across a <mark data-color="red">membrane</mark>) by <mark data-color="red">osmosis</mark></p></li></ul><p></p><ul><li><p>water molecules are <mark data-color="red">small</mark> enough to pass through a <mark data-color="red">semi permeable membrane</mark>- in pure water all molecules have ability/<mark data-color="red">potential</mark> to cross</p></li></ul><p></p><ul><li><p>as you dissolved a <mark data-color="red">solute</mark> in water some of the water molecules are attracted to the solute molecules- these no longer have <mark data-color="red">potential</mark> to cross membrane</p></li></ul>
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7

WATER POTENTIAL- VALUE

  • pure water has water potential of 0Kpa

  • has symbol (trident)- greek alphabet

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8

LOWERING WATER POTENTIAL

  • when solute molecules are added to water they lower the water potential (becomes negative)

  • bc solute bonds with water molecules reducing the water’s ability to move- concentration of free water molecules reduced

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