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Chemistry II Exam 3 Flashcards

Created by

@StatelyComposite

Questions and Answers

What is the conjugate acid of HCO3-?

H2CO3

What is the conjugate base of H2PO4-?

HPO4^2-

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)

LiOH Signup and view all the answers

Which of the following represents a conjugate acid-base pair from the equilibrium NH3(aq) + H2O(l) ⇌ NH4+(aq) + OH−(aq)?

H2O and OH(−) Signup and view all the answers

What is the conjugate base of HSO4−?

SO4^(2)− Signup and view all the answers

What is the conjugate acid of HPO42−?

H2PO4(−) Signup and view all the answers

Identify as an acid or a base: NH4+

Acid Signup and view all the answers

Identify as an acid or a base: HCl

Acid Signup and view all the answers

Identify as an acid or a base: hc2h3o2

Acid Signup and view all the answers

Identify as an acid or a base: KOH

Base Signup and view all the answers

Write a chemical equation for HCl(aq) showing how it is an acid according to the Arrhenius definition.

HCl(aq) → H+(aq) + Cl−(aq) Signup and view all the answers

Write a chemical equation for NH4+(aq) showing how it is an acid according to the Arrhenius definition.

NH4+(aq) → H+(aq) + NH3(aq) Signup and view all the answers

Write a chemical equation for KOH(aq) showing how it is a base according to the Arrhenius definition.

KOH(aq) → K+(aq) + OH−(aq) Signup and view all the answers

Write a chemical equation for HC2H3O2(aq) showing how it is an acid according to the Arrhenius definition.

HC2H3O2(aq) + H2O(l) → H3O+(aq) + C2H3O2−(aq) Signup and view all the answers

Which of the following solutions is a good buffer system? (Select all that apply)

A solution that is 0.10 M HC2H3O2 and 0.10 M LiC2H3O2 Signup and view all the answers

What is the Henderson-Hasselbalch equation?

pH = pKa + log[base]/[acid] Signup and view all the answers

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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Description

Test your knowledge on key concepts from Chemistry II with these flashcards. This quiz covers topics like conjugate acids and bases, and identifies Arrhenius acids. Perfect for quick revision before your exam!