Osmosis

Theories on the Cause of Osmosis A simple and appealing write up for osmosis is the niggardliness of piss explanation-- urine in pure pissing is provided much concentrated than pee in responses because the solute has to take up some room in the rootage. According to this idea, pissing diffuses into a hyperosmotic solution because it is diffusing down its tightness gradient. As Weiss (1996) points out, this predicts water movement in the decentlyfulness direction, tho not of the right magnitude. Water movement in osmosis is faster than diffusion, and seems to be more like mass water movement caused by a pressure difference (Weiss, 1996, p. 218). Also, as Salisbury and Ross (1992, p. 39) point out, adding solutes to a solution decreases the concentration of water in most cases, exclusively in some cases solutions have a higher concentration of water . The Handbook of Chemistry and Physics has a enormous section on solutions of common solutes, and it discloses tha t a 0.2 M solution of NaCl has a markedly higher water concentration (995 g/L) than a 0.2 M solution of sucrose (955 g/L) (Wolf et al., 1982, pp. D261 and D270). thence far our experiments will disclose that a potato cores loses water to a 0.2 M solution of NaCl but it gains water from a 0.2 M solution of sucrose. Also, if we compare 0.2 M solutions of sucrose and glucose, 0.

2 M glucose has a higher water concentration than 0.2 M sucrose (976 g/L vs. 955 g/L) (Wolf et al, 1982, p. D239) . This makes sense because the small glucose molecules take up less room in the solution. However, these 2 solutions have scarce ly the same osmotic potential. A close t! o more thickening theory that is often found in general biology books (including your text, p. 117) is the bound water explanation. This says that any hydrophilic solute (like sucrose or NaCl) will bind up hydrating water and prevent it from wretched freely. Therefore, the brass of a semipermeable tissue layer with pure water has a higher free water concentration than the side with...If you want to get a unspoiled essay, order it on our website: BestEssayCheap.com

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