25. Buffer capacity is higher if A) only the acid concentration is very high. B)

Question

25. Buffer capacity is higher if

A) only the acid concentration is very high.
B) only the base concentration is very high.
C) the acid and base are both dilute.
D) the acid and base are both concentrated.
E) Concentration does not affect buffer capacity

26. For optimal buffers,

27. For optimal buffers,

A) the concentration of acid is much higher than the concentration of base.
B) the concentration of base is much higher than the concentration of acid.
C) the concentration of acid is equal to the concentration of base.
D) there is only acid with no base.
E) there is only base with no acid.

28. What characterizes a buffer?

A) Resists a change in pH with the addition of a small amount of acid
B) Resists a change in pH with the addition of a small amount of base
C) Resists a change in pH with the addition of water
D) All of the above
E) None of the above

29. If 30.0 mL of 0.20 M HF is titrated with 0.10 M NaOH, the pH at 30.0 mL is

A) 7.00.
B) 3.45.
C) 2.23.
D) 2.31.
E) 8.14.

A) 4.74.
B) 7.00.
C) 9.25.
D) less than 2.
E) more than 10.

25. Buffer capacity is higher if A) only the acid concentration is very high. B) only the base concentration is very high. C) the acid and base are both dilute. D) the acid and base are both concentrated. E) Concentration does not affect buffer capacity 26. For optimal buffers, A) pH = nh3 is titrated with HCl, the pH at halfway to the equivalence point is A) 4.74. B) 7.00. C) 9.25. D) less than 2. E) more than 10. PKB. D) Any of the above work equally well E) pH is not related to the equilibrium constant 27. For optimal buffers, A) the concentration of acid is much higher than the concentration of base. B) the concentration of base is much higher than the concentration of acid. C) the concentration of acid is equal to the concentration of base. D) there is only acid with no base. E) there is only base with no acid. 28. What characterizes a buffer? A) Resists a change in pH with the addition of a small amount of acid B) Resists a change in pH with the addition of a small amount of base C) Resists a change in pH with the addition of water D) All of the above E) None of the above 29. If 30.0 mL of 0.20 M HF is titrated with 0.10 M NaOH, the pH at 30.0 mL is A) 7.00. B) 3.45. C) 2.23. D) 2.31. E) 8.14. 30. If pKa C) pH = Ka B) pH =

Explanation / Answer

B) only the base concentration is very high

26.
C) pH = pKb

27.D) there is only acid with no base.

28

B) Resists a change in pH with the addition of a small amount of base

29
B) 3.45.

30
C) 9.25

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