When I'm calculating solute potential, for salt, would it be (-2) (342)(.0831)(22)? I have it written as (-2) because of the ionic charges, but that makes its solute potential lower than that of distilled waters, which doesn't make sense because pure water has no solute.
And finally, to calculate water potential, are we just adding standard atmospheric pressure, +2 for each solution? Thanks!
Not sure where the 342 is coming from.
- (2 ions)(1M sol'n)(.0831pressure)(22+ 273 = t in K)
Yes, it should be negative - adding solute reduces the WP.
Once yu have SP, then add any pressure to find WP. If its an open container, or a cell that is NOT turgid, then the pressure is 0 (no pressure difference)
Ohhhh, okay. Right - ion # x the molarity x .0831 x the temperature 22 converted to Kelvin.
That's the solute potential, and also the water potential because there's no pressure, being an open container, huh?
Wow, I have so many questions - how can I tell how many ions a molecule has? I know salt has -(2), and looking it up online, I see sucrose has 0 ions because it's covalent, glucose has 6, and water has 0 ions because it's covalently bonded. That makes a little sense because then pure water's solute potential would be 0.