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 Supply (Water Fittings) Regulations 1999 notifications to be given. Part III deals with enforcement, penalties, tests and disputes. Schedule 1 categorizes water into five different levels fluid categories for "wholesomeness", while schedule 2 provides further explanation of terms used within the body of the regulations. Schedule 3 revokes previous water byelaws. Wholesome water supplied by a water undertaker and complying with the requirements of regulations made under section 67 of the Water Industry Act 1991. Water in fluid category 1 whose aesthetic quality is impaired owing to- Fluid which represents a slight health hazard because of the concentration of substances of low toxicity, including any