Definition
An acid is a molecule or ion capable of either donating a proton (i.e. hydrogen cation, H+), known as a Brønsted–Lowry acid, or forming a covalent bond with an electron pair, known as a Lewis acid.
Related concepts
Acceptor numberAcetateAcetic acidAcetylsalicylic acidAcid (disambiguation)Acid catalysisAcid dissociation constantAcid strengthAcidic (band)Acidic oxideAcidity (novelette)Acidity functionAcid–base extractionAcid–base homeostasisAcid–base reactionAcid–base titrationAlanineAlkylationAlpha and beta carbonAmineAmino acidAmino acidsAmmoniaAmmonium chlorideAmmonium nitrateAmphoterismAnionAqueous solutionAqueous solutionsAscorbic acidAspartic acidAspirinAtomic nucleusAtomic orbitalBase (chemistry)Basic oxideBeaker (glassware)BenzeneBenzenesulfonic acidBenzoic acidBicarbonateBisulfateBjerrum plotBoric acidBoron trifluorideBrønsted–Lowry acid–base theoryBuffer solutionCalciumCar batteryCarambolaCarbocationCarbohydrateCarbon dioxideCarbonateCarbonic acidCarbonylCarboraneCarboxylCarboxylic acidCatalystCell membraneCell wallCellular respirationChemical equilibriumChemical polarityChiral Lewis acidChirality (chemistry)Chloric acidChlorideChloroacetic acidChlorous acidChromic acidCitrateCitric acidColaCondensation reactionConjugate acidCorrosive substanceCovalent bondCytosolDNADehydration reactionDeprotonationDicarboxylic acidDichloroacetic acidDigestive enzymeDigestive enzymesDissociation (chemistry)Dissociation constantDonor numberECW modelElectron pairElectrophileEncyclopædia Britannica Eleventh EditionEnzymeEquilibrium chemistryEquilibrium constantEsterEsterificationEthanesulfonic acidFatty acidFluorideFluoroacetic acidFluoroantimonic acidFluoroboric acidFluorosulfuric acidFormic acidFreewareFrustrated Lewis pairGastric acidGilbert N. LewisGluconic acidGlycineHSAB theoryHammett acidity functionHelium hydride ionHenderson–Hasselbalch equationHexafluorophosphoric acidHydrobromic acidHydrochloric acidHydrofluoric acidHydrogen chlorideHydrogen fluorideHydrogen halidesHydroiodic acidHydronHydron (chemistry)HydroniumHydronium ionHydroxideHydroxylHypochlorous acidHypofluorous acidIUPACIbuprofenInorganicIntracellular pHIonJohannes Nicolaus BrønstedLactic acidLatinLewis acidLewis acid catalysisLewis acidsLewis acids and basesLewis baseLipophilicityLitmusLone pairLungsMagic acidMammalMartin LowryMethanesulfonic acidMicelleMineral acidMole (unit)Molecular oxygenMoleculeNeutralization (chemistry)Nitric acidNon-nucleophilic baseNucleic acidOrganic acidOrganic acidsOrganic baseOrganic compoundOxalic acidOxidizing agentP-Toluenesulfonic acidPHPH indicatorPenicillinPepsinPepsinogenPeptidoglycanPerchloric acidPhosphatePhospholipid bilayerPhospholipidsPhosphoric acidPhyllanthus emblicaPickling (metal)PolysaccharidePolystyrenePolystyrene sulfonic acidPotential energyPro-enzymeProduct (mathematics)ProteinProtonProton affinityProtonationRNARhubarbRobert de LevieSalt (chemistry)Self-ionization of waterSodium chlorideSodium fluorideSodium hydroxideSoft drinkSolid acidSoluteSolventStomachStrong acidSulfateSulfonic acidSulfuric acidSuperacidSuperbaseSvante ArrheniusTartaric acidTetrafluoroborateThomas Martin LowryTitrationToluenesulfonic acidTrichloroacetic acidTrifluoroacetic acidTrifluoromethanesulfonic acidValence electronVentilation (physiology)VinylogousWeak acidWeak baseWet cell batteryWikisourceZincZwitterion
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