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 crisis in the Democratic Republic of the Congo key aspect of the water reform. It includes the replacement of the CNAEA by a National Water Council, which will have the mandate to lead the whole water sector based on an IWRM approach, the establishment of Provincial Water Councils, Local Water Committees and Water User Associations as part of the decentralization approach, and the creation of agencies which are responsible for management of water resources at drainage basin and sub-basin levels. Furthermore, REGIDESO is subject to transformation to a commercial public enterprise. Only 46 percent of the DRC's population had access to an improved drinking water source in 2012,