Titration Curve of a Weak Acid.pptx - Titration Curve of a...

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Titration Curve of a Weak Acid
Acids and BasesNeutralizationTitrationAcid dissociation constant, KaIdentification of acid based on experimentally determined KaLearning Objective
TitrationA process in which a substancein a solutionof knownconcentration,standard solutionortitrant,is reactedSTOICHIOMETRICALLYwith a substance whoseconcentration is unknown,analyteA titration involving the reaction between an acid and a baseis called anacid-base titrationTitration is a quantitative analytical method used todetermine the concentration of the analyteNOTE:Terms to remember!!!Standard Solution:a solution of known concentration,titrantEquivalence Point:the point at which the moles of acid are equivalentto the moles of baseEndpoint:When the indicator changes color
Acid-Base TitrationsThestandard solutionortitrantgoesin aburette– a long glass tube with precise volumemarkings that allows small additions ofsolutionStandard solution or titrant is addedslowly from a buretteto a knownvolume of analyteThe analytes goes in an ErlenmeyerflaskTheequivalence pointof the titrationoccurs when stoichiometrically equalamounts of acid and base have beenadded to the solution
REMEMBERThe relative stoichiometry between substances MUST BEKNOWN!Knowing the volume and concentration of the titrantsolutionadded to the known volume of the analyte we candetermine the unknown concentrationAt theendpointwe have the following relationship betweenreacting substances:moles of titrant=moles of analyte(known concentration)(unknown concentration)
ReviewStrong and Weak AcidsHNO3(aq)+H2O(ℓ)NO3-(aq)+H3O+(aq)(H+donor)(H+acceptor)Strong Acid:Completely ionized,Ka>>1Weak Acid:Partially ionized,Ka< 1HNO2(aq)+H2O(ℓ)NO2-(aq)+H3O+(aq)(H+donor)(H+acceptor)
Relative Strengths ofAcids/BasesLeveling Effect:H3O+is the strongest H+donorthat can exist in waterStrong acids all have the samestrength in water - they arecompletely converted into H3O+ions
ReviewAcid-Base ReactionsNeutralizationMolecular Equation:HCl(aq) +NaOH (aq) →NaCl(aq) + H2O (ℓ)SALTMade up of thecationof thebaseplustheanionof theacid

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