1 / 6

Water Potential

Water Potential. The free energy per mole of water Calculated from two components: Solute potential (osmotic pressure) Pressure potential (turgor pressure). Water Potential. What is solute potential? Dependent on solute concentration Also called the osmotic potential

presley
Download Presentation

Water Potential

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Water Potential • The free energy per mole of water • Calculated from two components: • Solute potential (osmotic pressure) • Pressure potential (turgor pressure)

  2. Water Potential • What is solute potential? • Dependent on solute concentration • Also called the osmotic potential • What is pressure potential? • Results from exertion of pressure on a solution • Can be positive or negative (tension) • Sometimes called turgor pressure

  3. Water Potential • How does this affect movement of water? • Water moves from area of higher water potential (higher free energy) to lower water potential (lower free energy)

  4. Water Potential • Example: • Open beaker of pure water = zero • Solute pressure and pressure potential zero • Increase in pressure = increase in water potential • Addition of solute lowers solute potential = decreases water potential

  5. Water Potential • Solute potential is negative • Equation of solute potential = - iCRT • C = molar concentration • Increase solute concentration, decrease solute potential

  6. Water Potential • Example: • Cell separated from pure water by selectively permeable membrane • Potential is higher outside cell

More Related