Water of crystallization degree of hydration can be critical to the resulting chemical properties. For example, anhydrous RhCl is not soluble in water and is relatively useless in organometallic chemistry whereas RhCl•3HO is versatile. Similarly, hydrated AlCl is a poor Lewis acid and thus inactive as a catalyst for Friedel-Crafts reactions. Samples of AlCl must therefore be protected from atmospheric moisture to preclude the formation of hydrates. Crystals of hydrated copper(II) sulfate consist of [Cu(HO)] centers linked to SO ions. Copper is surrounded by six oxygen atoms, provided by two different sulfate groups and four molecules of water. A fifth water resides elsewhere
Water contamination in Lawrence and Morgan Counties, Alabama statement saying that new tests of the water returned a value of 14 parts per trillion, which is below the EPA health advisory level. However, officials of the water authority are still slightly concerned and continue to push for an activated carbon filter. Perfluorooctanic acid (PFOA) is commonly used as a degradation product with other perfluorinated compounds. PFOA is also used in the production of Teflon, also known as polytetrafluoroethylene, which is often used as a non-stick surface of many cooking items. The chemical often occurs in water systems in industrialized countries. Based on various animal data analysis, the compound