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Home/Science&Nature/Science/Chemistry/DifferenceBetweenAlkaliandBase
DifferenceBetweenAlkaliandBasePostedonOctober15,2011byadmin
AlkalivsBaseThe word alkali is often used interchangeably toaddresshighlybasicsolutionsandalkalimetals.Inthiscontext,alkaliisreferredtothealkalimetals.
Base
Basesaredefinedinseveralwaysbyvariousscientists.Arrheniusdefinesabaseasasubstance thatdonatesOH ions to the solution. Bronsted Lowry defines a
baseasa substance that canacceptaproton.According toLewis, anyelectrondonor isabase.AccordingtotheArrheniusdefinition,acompoundshouldhaveahydroxideanionandtheabilitytodonateitasahydroxideiontobeabase.However,accordingtoLewisandBronstedLowry,therecanbemolecules,whichdontpossesshydroxides,butcanactasabase.Forexample,NH isaLewisbase,becauseitcandonatetheelectronpaironnitrogen.Na CO isaBronstedLowrybasewithouthydroxidegroups,buthastheabilitytoaccepthydrogens.
Bases have a slippery soap like feeling and a bitter taste. They react easilywith acids producingwaterandsaltmolecules.Causticsoda,ammonia,andbakingsodaaresomeofthecommonbaseswecomeacrossveryoften.Basescanbecategorized into two,basedontheirability todissociateandproducehydroxideions.StrongbaseslikeNaOH,KOH,arecompletelyionizedinasolution,togiveions.WeakbaseslikeNH partiallydissociateandgivefeweramountsofhydroxideions.K isthebasedissociationconstant. Itgivesan indicationof theability to losehydroxide ionsofaweakbase.AcidswithahigherpK value (more than13)areweakacids,but theirconjugatebasesareconsidered as strong bases. To checkwhether a substance is a base or notwe can use severalindicatorslikelitmuspaperorpHpaper.BasesshowapHvaluehigherthan7,anditturnsredlitmustoblue.
Alkali
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Alkali isa termcommonlyused for themetals in thegroup1of theperiodic table.Thesearealsoknownasalkalimetals.AlthoughHisalsoincludedinthisgroup,itissomewhatdifferent.Therefore,lithium (Li), sodium (Na), potassium (K), Rubidium (Rb), Cesium (Cs) and Francium (Fr) aremembers of this group. Alkalimetals are soft, shiny, silvery colormetals. They all have only oneelectronintheiroutershell,andtheyliketoremovethisandform+1cations.Whentheoutermostelectronsareexcited,itcomesbacktothegroundstatewhileemittingradiationinthevisiblerange.Theemissionof thiselectron iseasy thus,alkalimetalsareveryreactive.Thereactivity increasesdown the column. They form ionic compoundswith other electronegative atoms.More accurately,alkaliisreferredtothecarbonateorthehydroxideofanalkalimetal.Theyalsohavebasicproperties.Theyarebitterintaste,slippery,andreactwithacids,tomakethemneutralized.
Whatisthedifferencebetweenbaseandalkali?
Group1metalsarereferredasalkali,ormoreaccurately,theircarbonates
andhydroxidesarereferredasalkali.However,theyhavebasicproperties,
thusisasubsetofbases.
Soallalkalisarebases,butnotallbasesarealkalis.
Alkaliisanionicsalt,whereasbasesarenecessarilynotso.
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1. DifferenceBetweenBaseandNucleophile2. DifferenceBetweenAcidandBase3. DifferenceBetweenAcidandAlkaline4. DifferenceBetweenBaseRateandBPLRRate5. DifferenceBetweenBrazeandWeld
FiledUnder:ChemistryTaggedWith:alkali,alkalimetals,alkalimetalsvs,alkalivs,Arrheniusbase,base,basedissociationconstant,basevs,bases,basicsolutions,BronstedLowry'sbase,characteristicsofalkalimetals,characteristicsofbase,commonbases,conjugatebases,Group1metals,ionicsalt,Lewisbase,propertiesofalkali,propertiesofbase,Strongbases,Weakbases
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