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Questions and Answers
What is the conjugate acid of HCO3-?
What is the conjugate acid of HCO3-?
H2CO3
What is the conjugate base of H2PO4-?
What is the conjugate base of H2PO4-?
HPO4^2-
Which of the following is an Arrhenius acid? (Select all that apply)
Which of the following is an Arrhenius acid? (Select all that apply)
- NH2CH3
- H2SO4 (correct)
- LiOH
- CH3CCl3
Which of the following is an Arrhenius base? (Select all that apply)
Which of the following is an Arrhenius base? (Select all that apply)
Which of the following represents a conjugate acid-base pair from the equilibrium NH3(aq) + H2O(l) ⇌ NH4+(aq) + OH−(aq)?
Which of the following represents a conjugate acid-base pair from the equilibrium NH3(aq) + H2O(l) ⇌ NH4+(aq) + OH−(aq)?
What is the conjugate base of HSO4−?
What is the conjugate base of HSO4−?
What is the conjugate acid of HPO42−?
What is the conjugate acid of HPO42−?
Identify as an acid or a base: NH4+
Identify as an acid or a base: NH4+
Identify as an acid or a base: HCl
Identify as an acid or a base: HCl
Identify as an acid or a base: hc2h3o2
Identify as an acid or a base: hc2h3o2
Identify as an acid or a base: KOH
Identify as an acid or a base: KOH
Write a chemical equation for HCl(aq) showing how it is an acid according to the Arrhenius definition.
Write a chemical equation for HCl(aq) showing how it is an acid according to the Arrhenius definition.
Write a chemical equation for NH4+(aq) showing how it is an acid according to the Arrhenius definition.
Write a chemical equation for NH4+(aq) showing how it is an acid according to the Arrhenius definition.
Write a chemical equation for KOH(aq) showing how it is a base according to the Arrhenius definition.
Write a chemical equation for KOH(aq) showing how it is a base according to the Arrhenius definition.
Write a chemical equation for HC2H3O2(aq) showing how it is an acid according to the Arrhenius definition.
Write a chemical equation for HC2H3O2(aq) showing how it is an acid according to the Arrhenius definition.
Which of the following solutions is a good buffer system? (Select all that apply)
Which of the following solutions is a good buffer system? (Select all that apply)
What is the Henderson-Hasselbalch equation?
What is the Henderson-Hasselbalch equation?
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Study Notes
Conjugate Acids and Bases
- Conjugate acid of HCO3- is H2CO3.
- Conjugate base of H2PO4- is HPO4^2-.
- Conjugate base of HSO4- is SO4^2-.
- Conjugate acid of HPO4^2- is H2PO4-.
- Conjugate acid-base pair example: H2O and OH− from the ammonia equilibrium reaction.
Arrhenius Acids and Bases
- H2SO4 is identified as an Arrhenius acid.
- LiOH is an Arrhenius base.
- Notable Arrhenius acids: HCl and HC2H3O2.
- Notable Arrhenius bases: KOH.
Chemical Equations for Arrhenius Definitions
- HCl dissociates in water: HCl(aq) → H+(aq) + Cl−(aq).
- Ammonium ion acts as an acid: NH4+(aq) → H+(aq) + NH3(aq).
- KOH dissociates in water: KOH(aq) → K+(aq) + OH−(aq).
- HC2H3O2 in water: HC2H3O2(aq) + H2O(l) → H3O+(aq) + C2H3O2−(aq).
Buffer Systems
- Effective buffer system example: 0.10 M HC2H3O2 and 0.10 M LiC2H3O2, containing a weak acid and its conjugate base.
Henderson-Hasselbalch Equation
- Formula: pH = pKa + log[base]/[acid].
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