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
Nonresidential water use in the U.S. their associated benchmarks) in order to assess their success in achieving water use efficiency goals. A “metric” (or “performance indicator”) is a unit of measure (based on a formula) that can be used to calculate the rate of water use during a given period of time (and at a given level of data aggregation). A “benchmark” is a particular (numerical) value of a metric that denotes a specific level of performance, such as a water-use efficiency target. When quantifying water use in the CII sector, the total volume of consumption (over any given time interval) at any given CII facility