Lipids are insoluble in water because they are nonpolar, and water is a polar molecule. Nonpolar substances are insoluble in polar substances, and polar substances are insoluble in nonpolar substances.
The effect of mixing polar and nonpolar liquids is similar to mixing magnetized marbles with regular ones. The magnetized marbles do not actively exclude the normal ones, but the attraction between them is much stronger, which means they naturally come together and exclude the regular ones. Polar molecules, such as water, have a "dipole moment" that give them an unevenly distributed charge. Negative ends of polar molecules are attracted weakly to positive ends of other polar molecules. Nonpolar molecules lack this uneven distribution of charge.Learn More
Butane is virtually insoluble in water and has a solubility of 61 milligrams per liter at 20 degrees Celsius. However, the solubility of butane in water can be considerably increased by decreasing the temperature of the water.Full Answer >
Copper(II) oxide is insoluble in water and different types of alcohols. This compound is soluble in solutions of strong acids and in hot acids, such as formic or acetic acid. It can also dissolve in an ammonia solution, but it does so at a very slow rate.Full Answer >
Carbon, hydrogen and oxygen are all elements that make up lipids. Lipids are one of the four major groups of organic molecules. The other three are carbohydrates, proteins and nucleic acid (DNA). One of the key characteristics of lipids is that they do not dissolve in water.Full Answer >
Pure water is neutral because the total electric charges of the atoms and ions that compose it are equal and opposite, so they cancel each other out. Water that isn't pure, such as drinking water, may contain other elements that can affect its acidity.Full Answer >