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 water scarcity problem, hindering development in the country. Article 48 of the 2006 Constitution of the DRC recognizes the human right to water. The rehabilitation and development of the water sector is a priority to which the national government committed itself in the Growth and Poverty Reduction Strategies and to which it agreed as part of the international framework of the UN Millennium Development Goals. The DRC is the most water-rich country in Africa. It accounts for approximately 52 percent of Africa's surface water reserves and 23 percent of Africa's internal renewable water resources. The internal renewable freshwater resources per