Timeline for Under what circumstances is "equality of osmotic pressure" functionally equivalent to "equality of osmolarity"?
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15 events
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| Nov 18 at 18:59 | comment | added | Poutnik | c1 = c0 + Δc1, c2 = c0 + Δc2, Δc = c2-c1 = Δc2 - Δc1. // [Δc2|/|Δc1| = V1/v2. // But those are rather details, mostly below the resolution level of the big picture of osmosis. | |
| Nov 18 at 18:34 | vote | accept | S.C. | ||
| Nov 18 at 18:21 | comment | added | Poutnik | 1.5 +/- Δc/2 // And yes, your conclusion is otherwise right. Remember that in science, zero is not zero, but the value interval statistically not significantly different to zero. Δh can be managed to be minimal and c itself is subject to uncertainty as well. Δh 2.5 cm means dosing of respective sugar wit accuracy 0.01% and consider unknown content of absorbed moisture and weighting errors.. | |
| Nov 18 at 18:02 | comment | added | S.C. | That is to say that, at equilibrium, the left side's sucrose osmolarity is $1.5+\Delta c$, and the right side's sucrose osmolarity is $1.5 - \Delta c$. Is this correct? If so, is the argument something like, "$\Delta h$ is negligibly small and, therefore, so, too, is $\Delta c$, in which case $1.5+\Delta c \approx 1.5$ and $1.5-\Delta c \approx 1.5$" | |
| Nov 18 at 18:02 | comment | added | S.C. | Given that the left side has a larger concentration of sucrose (than the right side), net water movement will take place and hydrostatic pressure correspondingly accumulates in that left compartment (i.e. the water level is raised on the left side). Accordingly, this added hydrostatic pressure will offset the ability to balance the left and right osmolarities of sucrose by $\Delta c = \dfrac{\rho g}{RT} \Delta h$. | |
| Nov 18 at 18:02 | comment | added | S.C. | I see that you just posted a very recent edit, but I will focus my attention on your prior edit ...the section titled: "Macroscopic conditions of osmotic equilibrium". Specifically, your comments here make me even FURTHER doubt the answer to the aforementioned problem about sucrose (biology.stackexchange.com/questions/113498/…). | |
| Nov 18 at 17:43 | history | edited | Poutnik | CC BY-SA 4.0 |
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| Nov 16 at 9:59 | history | answered | Poutnik | CC BY-SA 4.0 |