Quicklime CaO

Its natural and prepared compounds are widely used. Quicklime (CaO), which is made by heating limestone that is changed into slaked lime by carefully adding water, is the great base of chemical refinery with countless uses. 

Quicklime, CaO, has a density range of approximately 55 to 75 Ib/cu ft, and a molecular weight of 56.08. A slurry for feeding, called milk of lime, can be prepared with up to 45 percent solids. Lime is only slightly soluble, and both lime dust and slurries are caustic in nature. A saturated solution of lime has a pH of about 12.4. 

Monatomic anions, such as the Cl- ions in sodium chloride and the O2- ions in quicklime (CaO), are named by adding the suffix -ide and the word ion to the first part of the name of the element (the stem" of its name), as shown in Table D.l thus, S2 is a sulfide ion and O2 is an oxide ion. There is usually no need to specify the charge, because most elements that form monatomic anions form only one kind of ion. The ions formed by the halogens are collectively called halide ions and include fluoride (F ), chloride (Cl-), bromide (Br-), and iodide (I ) ions. 

M.l When limestone, which is principally CaCO, is heated, carbon dioxide and quicklime, CaO, are produced by the reaction CaC03(s) A > CaO(s) + C02(g). If 17.5 g of C02 is produced from the thermal decomposition of 42.73 g of CaCO , what is the percentage yield of the reaction ... 

Hydrated or slaked lime Ca(OH)2 is an inorganic accelerator used in the curing of fluoroelastomers. In conventional sulphur cured polymers it counteracts the retardation of cure due to the presence of acidic substances in a rubber compound. Quicklime (CaO) dispersed in mineral oil or in wax/oil is used as a dessicant to reduce porosity in vulcanisates, particularly in fluid bed curing. 

Liming an acidic lake is similar to the process many people use to maintain a pH balance in their soil for lawn maintenance. Plants have an optimum pH range in which they strive. Acidic conditions often develop in soils for several reasons. Rain tends to leach away basic ions, weak organic acids develop from the carbon dioxide produced by decaying organic matter, and strong acids, such as nitric acid, can form when ammonium fertilizers oxidize. To neutralize these acids, different forms of lime such as quicklime, CaO, and slaked lime, Ca(OH)2, are used to neutralize the acid and increase the pH of the soil. Table 13.9 shows how much fertilizer is wasted when applied to... 

Quicklime (CaO) is produced by heating limestone (CaCC>3) to drive off C02 gas. Is the reaction spontaneous under standard conditions at 25°C Calculate the temperature at which the reaction becomes spontaneous. 

Find the heat evolved in slaking 1 kg of quicklime (CaO) according to the reaction... 

Irritant dermatitis does not involve an immune response and is typically caused by contact with corrosive substances that exhibit extremes of pH, oxidizing capability, dehydrating action, or tendency to dissolve skin lipids. In extreme cases of exposure, skin cells are destroyed and a permanent scar results. This condition is known as a chemical burn. Exposure to concentrated sulfuric acid, which exhibits extreme acidity, or to concentrated nitric acid, which denatures skin protein, can cause bad chemical bums. The strong oxidant action of 30% hydrogen peroxide likewise causes a chemical bum. Other chemicals causing chemical bums include ammonia, quicklime (CaO), chlorine, ethylene oxide, hydrogen halides, methyl bromide, nitrogen oxides, elemental white phosporous, phenol, alkali metal hydroxides (NaOH, KOH), and toluene diisocyanate. 

Limestone, chalk, and marble are all forms of calcium carbonate. Limestone rock can be used to build roads, but it is a very important basic compound used in large quantities by chemical industries. For example, limestone is used directly to make concrete and cement. It is also used in the manufacture of glass and in agriculture. Limestone is often processed to make quicklime, CaO, and hydrated lime (calcium hydroxide), Ca(OH)2. 

The common names and formulas for several substances c. quicklime CaO... 

Quicklime (CaO) is produced by the thermal decomposition of calcium carbonate (CaC03). Calculate the volume of C02 produced at STP from the decomposition of 152 g of CaC03 according to the reaction... 

Limestone (CaC03) decomposes upon heating to yield quicklime (CaO) and carbon dioxide. At what temperature does limestone exert a decomposition pressure of l(atm) ... 

ABSTRACT As a step in the application of the cracking of tar in fuel gas amelioration the characteristics of the endothermic reaction potential of tar was studied experimentally and theoretically. In this context, however, due to the structural complexity of tar and/or tany constituents in fuel gas well defined hydrocarbons as tar model compounds were applied with inexpensive and readily available materials (dolomites, dolomitic magnesium oxide [MgO], quicklime [CaO]). The effects of operation condition on extent of hydrocarbon conversion, gas product composition, and corresponding endotherai of the reaction potential have been explored. The results obtained in this work provide a basis for ture considerations of catalytic tar cracking. 

Oxygen occurs in all kinds of minerals. Some common examples include the oxides, carbonates, nitrates, sulfates, and phosphates. Oxides are chemical compounds that contain oxygen and one other element. Calcium oxide, or lime or quicklime (CaO), is an example. Carbonates are compounds that contain oxygen, carbon, and at least one other element. Sodium carbonate, or soda, soda ash, or sal soda (Na2C03), is an example. It is often found in detergents and cleaning products. 

Quicklime, CaO, can be prepared by roasting limestone, CaC03, according to the chemical equation below. When 2.00 x 10 g of CaC03 are heated, the actual yield of CaO is 1.05 X10 g. What is the percentage yield ... 

The term lime normally covers both limestone (CaCO ) and quicklime (CaO), which is produced from it by calcination. Slaked lime [Ca(OH)2l is formed by reacting quicklime with water. 

Pieces of quicklime (CaO), distilled water, dilute hydrochloric acid. Experimental Procedure... 

The sodium carbonate formed from the removal of temporary hardness is available to precipitate any calcium or magnesium salts present as permanent hardness. Thus, the usual water treatment for removal of hardness involves adding a mixture of quicklime (CaO) and sodium carbonate in accordance with the amount of permanent hardness present. Sometimes a coagulant such as alum (Al2(S04)3 I4H2O) or ferrous sulfate will be added to help coagulate and settle any finely divided hardness in suspension [18]. 

Calcium sulfate is the essential component of plaster and sheet rock. Waste calcium sulfate can be converted into quicklime, CaO, by reaction with carbon at high temperatures. The following two reactions represent a sequence of reactions that might take place ... 

Heating limestone, CaC03, produces quicklime, CaO, which can then be treated with water to form slaked lime, Ca(OH)2, an inexpensive base for which industry finds many uses. When slaked lime is mixed with sand and exposed to the CO2 of the air, it hardens to form mortar. Heating gypsum, CaSO - 2H2O, produces plaster of Paris, 2CaS04... 

Thus, each molecule of magnesium bicarbonate present requires two of lime for complete precipitation, and every part of temporary hardness due to magnesium, expressed as calcium carbonate, requires 2 x 56 = 112 of quicklime (CaO). Water will often contain dissolved carbon dioxide which will combine with some of the lime added for softening ... 

Limestone (CaC03) is decomposed by heating to quicklime (CaO) and carbon dioxide. Calculate how many grams of quicklime can be produced from 1.0 kg of limestone. 

Calcium oxide or quicklime (CaO) is used in steelmaking, cement manufacture, and pollution control. It is prepared by the thermal decomposition of calcium carbonate ... 

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