Chem 1211 1st Edition Lecture 9 Outline of Last Lecture I Equilibrium reaction II Aqueous solutions Outline of Current Lecture I Acids and Bases II Conjugate Acid Base Pairs Current Lecture I Acids and Bases a Reactions fit in the category of equilibrium i Under the conditions of the reaction the products that you make can easily revert back to the original reactants b Strong Acid Strong Base i D E F G products favored ii H2SO4 H2O 2H SO4 c Weak Acids Weak Bases i H3CO2 H20 CH3CO2 H mostly acetic acid d ConcepTest Which acid is categorized INCORRECTLY i HF weak ii H3PO4 weak iii H2CO3 strong 1 ANSWER iii they are all weak e Sources of OH are strong bases f Strength of base acid is a property that is inherent in the molecules If you take HCl that molecule wants to disassociate into H and Cl In an equilibrium reaction there is a balance between how much Cl wants to disassociate and H wants to hold on g ConcepTest Which statement is TRUE about hydronium H3O knowing that H H2O H2O i It is a conjugate base in the reaction of H2SO4 H2O These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute ii iii iv v II It represents a proton solvated by 1 or more waters It is predicted by Arrhenius but not Bronsted Lowry It is a complex ion in which O is attached to all 3 H None are true 1 ANSWER v none are true it represents a proton solvated by 1 or more waters AND it is a complex ion in which O is attached to all 3H a Reasoning It is really the conjugate acid in the reaction It is predicted by Arrhenius and Bronsted Lowrey h ConcepTest Which are acid conjugate base pairs in a proton transfer reaction in water i HF Fii HO H2O iii H2CO3 CO321 ANSWER i and ii 2 Reasoning a HO H2O H0 conjugate base H20 conjugate acid b H2CO3 acid H2O base H3O conjugate acid HCO3 conjugate base i Water can be acid or base depending on scenario Conjugate Acid Base Pairs a Examples pairs differ by a proton i HF H F H HF ii H2O H OH H H2O b ConcepTest Which is considered a basic oxide based on the product it forms when added to water i CO2 ii SO3 iii CO2 and SO3 iv CaO v None of these 1 ANSWER iv CaO a Reasoning Basic oxides are formed mainly by metals especially the alkali metals and alkaline earth metals c ConcepTest What is the likely product in this gas forming reaction i HCl aq NaHCO3 aq 1 ANSWER CO2
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