Tonicity
Tonicity is defined as:
The ability of an extracellular solution to ?? or ?? water
Gain or Lose
What are the unit(s) for solute potential?
Megapascals (MPa) and Bars
What unit must temperature be in when substituting numbers into the equation to calculate for solute potential?
Kelvin
What are the three types of solutions cells can be in?
Isotonic, Hypotonic, or Hypertonic
What does water potential indicate?
The direction of the flow of water
What unit(s) are used for solute potential?
MPa and or bars
Tonicity depends on the concentration of what that cannot pass through the membrane?
Solutes
What is the solute potential of pure water?
Including units
0 MPa
What does the variable i stand for in the equation for solute potential?
Ionization Constant
Cells immersed in an isotonic solution have what net movement of water?
A net movement of 0. No net movement is also acceptable.
What is the conversion factor from MPa to bars?
1 MPa = x bars
10 Bars
What is the ionization constant if no ions are formed?
The ionization constant is 1
In a hypotonic environment, what will happen to plant cells and what will happen to animal cells?
Animal cells with swell and lyse
Plant cells will work optimally
What is the relationship between an increase in solutes to the binding of free water?
How does it impact water potential?
a) An increase in solutes incites binding to more free water
b) Water potential is decreased or reduced
What are the values for the two Pressure Constants for the following units:
liter bars/mol-K
liter MPa/mol-K
0.0831 liter bars/mol-K
0.00831 liter MPa/mol-K
YOU MAKE TAKE OUT YOUR CALCULATOR FOR THIS QUESTION, BUT NOT YOUR PHONES.
In a lab, a 0.6M sucrose solution is left on a countertop, subject to the open air. Calculate the solute potential at 37 degrees celsius. Round to the hundredths place if necessary. Leave your final answer in bars.
Solute potential = -iCRT
Solute potential= -(1)(0.6)(0.0831)(310)= -15.4566
Rounded final answer: -15.46 bars
(Unit must be included)