Osmosis is the movement of solvent molecules through a selectively permeable membrane into a region of higher solute concentration, aiming to equalize the solute concentrations on the two sides. It may also be used to describe a physical process in which any solvent moves, without input of energy, across a semipermeable membrane (permeable to the solvent, but not the solute) separating two solutions of different concentrations." It's a type of passive transport, which means it doesn't require energy to make it happen.
salt (sodium chloride or NaCl), so much salt that our bodies can't excrete the sodium quick enough to bring our bodies into balance. The concentration of sodium in our blood reaches toxic levels, "removing water from cells and interfering with nerve conduction". (From Wikipedia) We have a seizure, then die.
Water, water, everywhere, and all the boards did shrink.
Water, water, everywhere, nor any drop to drink.
- Rime of the Ancient Mariner.
Check out the song "Rime of the Ancient Mariner" from Iron Maiden's album, Powerslave. Awesome! Completely and utterly awesome! I couldn't resist an Iron Maiden reference in a chemistry post!
This is one of the arguments for why glycerin allegedly removes water from your skin when it's not so humid outside, which is why it's Chemistry Sunday - I'm researching this claim, and realized that osmosis is an important part of understanding how our skin works!
Here's a little video on the process of osmosis!
Join me tomorrow for more fun with chemistry as we take a look at electrolytes!