Chem II Exam 3

Which of the following solutions is a good buffer system? A solution that is 0.10 M HI and 0.10 M NH4+ A solution that is 0.10 M NaOH and 0.10 M KOH A solution that is 0.10 M HBr and 0.10 M KC2H3O2 A solution that is 0.10 M HC2H3O2 and 0.10 M LiC2H3O2 None of the above are buffer systems.

A solution that is 0.10 M HC2H3O2 and 0.10 M LiC2H3O2 weak acid and conjugate base

Identify as an acid or a base: HCl

Acid

Identify as an acid or a base: NH4+

Acid

The following equation shows the equilibrium in an aqueous solution of ammonia: NH3(aq)+H2O(l)⇌NH4+(aq)+OH−(aq) Which of the following represents a conjugate acid-base pair?

H2O and OH(−)

What is the conjugate acid of HPO42− ?

H2PO4(−)

Which of the following is an Arrhenius acid? LiOH NH2CH3 CH3CCl3 H2SO4 More than one of these is an Arrhenius acid.

H2SO4

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

HC2H3O2(aq)+H2O(l)→H3O+(aq)+C2H3O2−(aq)

What is the conjugate acid of HCO3- ?

HCO31- is the conjugate acid of the base CO32-. H2O is the conjugate acid of the base OH1-. the conjugate base pair is *H2CO3*

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

HCl(aq)→H+(aq)+Cl−(aq)

What is the conjugate base of H2PO4- ?

HPO4^2-

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

KOH(aq)→K+(aq)+OH−(aq)

Which of the following is an Arrhenius base? H3OH NaBr CH3CO2H LiOH More than one of these compounds is an Arrhenius base.

LiOH

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

NH4+(aq)→H+(aq)+NH3(aq)

What is the conjugate base of HSO4−?

SO4^(2)−

Identify as an acid or a base: hc2h3o2

acid

Identify as an acid or a base: KOH

base

What is the Henderson-Hasselbalch equation?

pH=pKa+log[base]/[acid]