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Water has a number of important properties essential for life. Many of the properties below are due to the hydrogen bonds in water.

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Water An essay on water by John Asdas (12gv) Water molecules are charged, with the oxygen atom being slightly negative (d-) and the hydrogen atoms being slightly positive (d+). These opposite charges attract each other, forming hydrogen bonds. These are weak, long distance bonds that are very common and very important in biology. Water has a number of important properties essential for life. Many of the properties below are due to the hydrogen bonds in water. Solvent. Because it is charged, water is a very good solvent. Charged or polar molecules such as salts, sugars, amino acids dissolve readily in water and so are called hydrophilic ("water loving"). Uncharged or non-polar molecules such as lipids do not dissolve so well in water and are called hydrophobic ("water hating"). ...read more.


and plants (transpiration). As water evaporates it extracts heat from around it, cooling the organism. Latent heat of fusion. Water also requires a lot of heat to change state from a solid to a liquid, and must loose a lot of heat to change state from a liquid to a solid. This means it is difficult to freeze water, so ice crystals are less likely to form inside cells. Density. Water is unique in that the solid state (ice) is less dense that the liquid state, so ice floats on water. As the air temperature cools, bodies of water freeze from the surface, forming a layer of ice with liquid water underneath. ...read more.


acetic acid acetate- + H+). The names of the acid and ionised forms (acetic acid and acetate in this example) are often used loosely and interchangeably, which can cause confusion. You will come across many examples of two names referring to the same substance, e.g.: phosphoric acid and phosphate, lactic acid and lactate, citric acid and citrate, pyruvic acid and pyruvate, aspartic acid and aspartate, etc. The ionised form is the one found in living cells. pH. Water itself is partly ionised, so it is a source of protons (H+ ions), and indeed many biochemical reactions are sensitive to pH. Pure water cannot buffer changes in H+ concentration, so is not a buffer and can easily be any pH, but the cytoplasms and tissue fluids of living organisms are usually well buffered at about neutral pH (pH 7-8). ...read more.

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