Slaked Lime - Structure, Preparation, Properties and Uses

Uses of Calcium Hydroxide · For white washing – Slaked lime is used in white washing. · For manufacturing of sugar – Slaked lime is used in manufacturing of sugar ... ClaimyourFREESeatinVedantuMasterClasses!RegisternowFreeClassesSigninSlakedLimeChemistrySlakedLimeStructureofCalciumHydroxideAsstatedabovethechemicalformulaofcalciumhydroxideisCa(OH)2.Itisanioniccompound.Inwhichcalciumlosesitstwoelectronstopolyatomichydroxideions.Thus,inslakedlimeCa+2ionsformsoneionicbondwitheachOH-ions.Althoughoxygenandhydrogenatomsofpolyatomichydroxideanionpossesscovalentbondsbetweenthem.Stronghydrogenbondsexistbetweenthelayersofcalciumhydroxides.That’swhyithashexagonalcrystalstructure.[StructureofCalciumHydroxide-Imagewillbeuploadedsoon][DeducingtheFormulaofCalciumHydroxide-Imagewillbeuploadedsoon]PreparationofCalciumHydroxide FromCalciumOxide-Commercialproductionofcalciumhydroxideisdonebytreatingquicklimewithwater.Calciumoxideiscommonlyknownasquicklime.Theprocessofproductionofcalciumhydroxidefromlimeiscalledslakingoflimeaswhenalimitedquantityofwaterismixedwithquicklimeitdisintegratesandcrumbles.Thereactioninvolvedisgivenbelow–CaO+H2O🡪Ca(OH)2FromCalciumChloride–Inlaboratoriesslakedlimeispreparedbymixingaqueoussolutionsofcalciumchlorideandcausticsoda.Causticsodaisacommonnameforsodiumhydroxide. CaCl2+2NaOH🡪Ca(OH)2+2NaClPropertiesofCalciumHydroxide PhysicalProperties– Itsmolarmassis74.09g/mol. Itappearsascolorlesscrystalsorwhitepowder.Itisodorless.Itsmeltingpointis580℃. Itissolubleinwater,glycerol,andacids.Aqueoussolutionofcalciumhydroxideiscalledlimewater.Itssolubilitydecreaseswithincreaseintemperature.Itssuspensioninwateriscalledmilkoflime. Itisinsolubleinalcohol.Itisbasicoralkalineisnature. Chemicalproperties– Carbonatation–Calciumhydroxidereactswithcarbondioxidetoformcalciumcarbonateandwater.Reactionisgivenbelow–Ca(OH)2+CO2→CaCO3+H2ODecomposition–Whencalciumhydroxideisheatedto512℃,itdecomposesintocalciumoxide(quicklime)andwater.Reactionisgivenbelow–Ca(OH)2→CaO+H2OReactionWithDiluteHCl(Acid)–Whencalciumhydroxidereactswithdil.Hydrochloricacid,itgivescalciumchlorideandwater.Reactionisgivenbelow-Ca(OH)2+2HCl(diluted) 🡪CaCl2+2H2OReactionWithConcentratedAcid–Whencalciumhydroxidereactswithconcentratedsulfuricacid,itformswaterandprecipitateofcalciumsulphate.Reactionisgivenbelow–Ca(OH)2+H2SO4(conc.)🡪CaSO4↓+2H2OReactionWithHydrogenSulfide–Whencalciumhydroxidereactswithhydrogensulfide,itgivescalciumhydrosulfideandwater.Reactionisgivenbelow–Ca(OH)2+2H2S🡪Ca(HS)2+2H2OPreparationofAmmonia–Onreactingwithammoniumchloride,calciumhydroxidegivesammonia,calciumchlorideandwater.Reactionisgivenbelow-Ca(OH)2+2NH4Cl→2NH3+CaCl2+2H2OReactionWithFlowersofSulfur–Whentheseareboiledwithcalciumhydroxide,theyformlimesulfur.Reactionisgivenbelow–3Ca(OH)2​+12S→2CaS5​+CaS2​O3​+3H2​OUsesofCalciumHydroxide Weareusingcalciumhydroxidefromancientwarfare,RomanEmpiretimetomodernindustry.youwillbeamazedtoknowthatRomanempireextensivelyusedlime–basedmortarsintheirarchitectureandlimeispresentintheconstructionmaterialofthegreatwallofchina.Fewofitsmodernageusesarelistedbelow–Forwhitewashing–Slakedlimeisusedinwhitewashing.Itreactswithcarbondioxideslowlyandformsalayerofcalciumcarbonateonthewallwhichgivesshinetothewall.Formanufacturingofsugar–Slakedlimeisusedinmanufacturingofsugarfromsugarcane.Itmakessugarcanejuicealkalineandprecipitatesitsimpurities. Itisusedinsewagetreatment.Itisusedasaflocculantinwater. Itisusedinthepaperindustry. Itisusedinpickles.Itisusedtoprocesswaterforvariousbeverages. Itisusedtoremovethecellulosehullofmaizekernels. Itisusedasadigestiveaid. Itisusedinmakingpapadum.Itisalsousedinpaanandtobacco.Thiswasallaboutslakedlime,ifyouarelookingforNCERTSolutionsordetailedstudynotesonvarioustopicsofchemistrythenlogontoVedantuordownloadVedantuLearningApp.BydoingsoyouwillgetaccesstofreepdfsofNCERTSolutions,studynotes,revisionnotesandmocktestsetc.NCERTStudyMaterialNCERTSolutionsNCERTSolutionsforClass12PhysicsNCERTSolutionsforClass12ChemistryNCERTSolutionsforClass12BiologyNCERTSolutionsforClass11PhysicsNCERTSolutionsforClass11ChemistryNCERTSolutionsforClass11BiologyNCERTSolutionsforClass10ScienceNCERTSolutionsforClass9ScienceNCERTSolutionsforClass8ScienceNCERTSolutionsforClass7ScienceNCERTSolutionsforClass6ScienceNCERTBookSolutionsNCERTNCERTSolutionsNCERTSolutionsforClass12MathsNCERTSolutionsforClass12PhysicsNCERTSolutionsforClass12ChemistryNCERTSolutionsforClass12BiologyNCERTSolutionsforClass11MathsNCERTSolutionsforClass11PhysicsNCERTSolutionsforClass11ChemistryNCERTSolutionsforClass11BiologyNCERTSolutionsforClass10MathsNCERTSolutionsforClass10ScienceNCERTSolutionsforClass9MathsNCERTSolutionsforClass9ScienceReferenceBookSolutionsHCVermaSolutionsRDSharmaSolutionsRDSharmaClass10SolutionsRDSharmaClass9SolutionsRSAggarwalSolutionsRSAggarwalClass10SolutionsICSEClass10solutionsLakmirSinghSolutionsTextBookSolutionsImportantFormulasMathFormulaPhysicsFormulaChemistryFormulaQuestionPapersPreviousYearQuestionPaperCBSEPreviousYearQuestionPaperforClass10CBSEPreviousYearQuestionPaperforClass12SamplePaperCBSEClass12SamplePapersCBSEClass10SamplePapersICSEClass10SamplePapersMathsPhysicsChemistryBiologyPracticeQuestionsExamsIITJEENEETAIIMSKVPYKCETC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