Calculations1112 II handout

1pHpHcalculationscalculationsMUDr. Jan Pl ten k, PhDBrBr nstednsted--LowryLowryconceptconceptof of acidsacidsandandbasesbases Acid is a proton donor Base is a proton acceptorHCl(aq) + H2O(l) H3O+(aq) + Cl-(aq)AcidBaseConjugateacidConjugatebas eH2O(l) + NH3(aq) NH4+(aq) + OH-(aq)BaseAcidConjugateacidConjugatebas e2 WhichWhichof of thethefollowingfollowingare are conjugateconjugateacidacid--base base pairspairs??A) HCl, NaOHB) H2O, OH-C) H2SO4, SO42-D) H2SO3, HSO3-E) HClO4, ClO3-F) H3C-NH2, H3C-NH3+AutoionizationAutoionizationof waterof waterWater is amphoteric as it can behave both as acid and base2 H2O(l)H3O+(aq) + OH-(aq) Kw= [H3O+][OH-] = [H+][OH-]Ion-product constant for water:In pure water at 25 C:[H+] = [OH-] = 10-7mol/LKw= ( 10-7mol/L) ( 10-7mol/L) = 10-14mol2

1 pH calculations MUDr. Jan Pláteník, PhD Br ønsted -Lowry concept of acids and bases • Acid is a proton donor • Base is a proton acceptor

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