True or False Exam 3

Question 1

A higher concentration of buffer components gives a better buffer capacity.

Answer 1

true

Question 2

the H2PO4-/HPO4-2 bufer si common ni living systems.

Answer 2

true

Question 3

for a buffer solution, when the conjugate ratio is one, then pH = pKa.

Answer 3

true

Question 4

increasing the ratio of the conjugate pair (base/acid) wil decrease the pH of a buffer solution.

Answer 4

false

Question 5

The addition of strong acid to a buffer solution increases the pH of the solution.

Answer 5

false

Question 6

Dilution favors that side of an equation which has more gas or solute particles.

Answer 6

True

Question 7

For every equilibrium system, decreasing the volume wil shift the equilibrium position to the right.

Answer 7

false

Question 8

For an exothermic process, the equilibrium constant will increase at higher temperatures.

Answer 8

false

Question 9

Adding more solid reactant to a system increases Q.

Answer 9

false

Question 10

consider the following system at equilibrium.
BaSO,(5) + H(aq) = Ba?(aq) + HSO4(aq) ДН° = 48.2 kJ
Wil the following actions favor a shift to the right side, to the left side, or have no such effect? DECREASE TEMPERATURE

Answer 10

left

Question 11

Consider the following system at equilibrium.
BaSO,(5) + H(aq) = Ba?(aq) + HSO4(aq) ДН° = 48.2 kJ
Wil the following actions favor a shift to the right side, to the left side, or have no such effect? ADD A SOULUBLE BARIUM SALT

Answer 11

left

Question 12

Consider the following system at equilibrium.
BaSO,(5) + H(aq) = Ba?(aq) + HSO4(aq) ДН° = 48.2 kJ
Wil the following actions favor a shift to the right side, to the left side, or have no such effect? INCREASE THE AMOUNT OF WATER SOLVENT

Answer 12

right

Question 13

Consider the following system at equilibrium.
BaSO,(s) + H(aq) = Ba?(aq) + HSO4(aq) ДН° = 48.2 kJ
Wil the following actions favor a shift to the right side, to the left side, or have no such effect? ADD MORE BaSO4(s)

Answer 13

no effect

Question 14

Consider the following system at equilibrium.
PA(s) + 12 HC (g) ~ 4 PC|3(9) + 6H2(9)
AH° = -47.08 kJ
Wil the following actions favor a shift to the right side, to the left side, or have no such effect? ADD MORE P4

Answer 14

no effect

Question 15

Consider the following system at equilibrium.
PA(s) + 12 HC (g) ~ 4 PC|3(9) + 6H2(9)
AH° = -47.08 kJ
Wil the following actions favor a shift to the right side, to the left side, or have no such effect? INCREASE H2 PRESSURE

Answer 15

left

Question 16

Consider the following system at equilibrium.
PA(s) + 12 HC (g) ~ 4 PC|3(9) + 6H2(9)
AH° = -47.08 kJ
Wil the following actions favor a shift to the right side, to the left side, or have no such effect? ADD NE(G) TO INCREASE THE TOTAL PRESSURE IN THE SYSTEM

Answer 16

no effect

Question 17

Consider the following system at equilibrium.
PA(s) + 12 HC (g) ~ 4 PC|3(9) + 6H2(9)
AH° = -47.08 kJ
Wil the following actions favor a shift to the right side, to the left side, or have no such effect? DECREASE THE VOLUME OF THE SYSTEM

Answer 17

right

Question 18

Hydrobromic acid is a strong acid.

Answer 18

true

Question 19

Chloride has no significant pul on H+ of H30+.

Answer 19

true

Question 20

Water can completely dissociate HF.

Answer 20

false

Question 21

in pure water, [OH-] = 1.0 × 10^-14 M.

Answer 21

false

Question 22

The protonation of a base gives a conjugate acid.

Answer 22

true

Question 23

Acetate has no significant pul on H+ of H3O+.

Answer 23

false

Question 24

Oxalic acid is a weak acid.

Answer 24

true

Question 25

in basic solution, pOH > pH.

Answer 25

false

Question 26

a solution of pH 3 is more acidic than a solution of pH 4.

Answer 26

true

Question 27

NO2^-is the conjugate base of nitric acid.

Answer 27

false

Question 28

When ammonia dissolves ni water, every molecule of ammonia becomes protonated.

Answer 28

false

Question 29

When ammonia dissolves ni water, every molecule of ammonia becomes protonated.

Answer 29

false

Question 30

As [OH] increases, pH increases.

Answer 30

true

Question 31

As pOH increases, [H+] decreases.

Answer 31

false

Question 32

H2PO4^- and HPO4^2- are a conjugate pair.

Answer 32

true

Question 33

Upon dissolving in water, hydrogen iodide wil protonate water.

Answer 33

true

Question 34

Water molecules can pull on each other and break an O-H bond (at least to some extent).

Answer 34

true

Question 35

Asolution of pH 6 is more basic than a solution of pOH 6.

Answer 35

false

Question 36

Water can protonate a base and it can deprotonate an acid.

Answer 36

true

Question 37

Bisulfate is the conjugate acid of sulfate.

Answer 37

true

Question 38

In a weak acid solution, dilution favors dissociation.

Answer 38

true

Question 39

perchloric acid is diprotic.

Answer 39

false

Question 40

Water can deprotonate bisulfate ion (at least to some extent).

Answer 40

true

Question 41

the Ka of H2PO4- is greater than the Ka of HPO4^2-

Answer 41

true

Question 42

HClO, is a stronger acid than HCI

Answer 42

false

Question 43

Amines are weak bases.

Answer 43

true

Question 44

Protonated amines are weak acids.

Answer 44

true

Question 45

Anions of weak, monoprotic acids are weak bases.

Answer 45

true

Question 46

Acetate ion is a better base than cyanide ion.

Answer 46

false

Question 47

Ammonia is a better base than phosphate ion.

Answer 47

false

Question 48

Metal cations of 3+ charge are acidic.

Answer 48

true