An important buffer in the blood is a mixture of_______. a) sodium chloride and

ID: 830306 • Letter: A

Question

An important buffer in the blood is a mixture of_______.

a) sodium chloride and hydrochloric acid

b) hydrochloric acid and sodium hydroxide

c) carbonic acid and bicorbonate ion

d) acetic acid and bicorbanate ion

e) acitic acid and carbonate ion

2) Identify a good buffer.

a) small amounts of both a weak acid and its conjugate base

b) significant amounts of both a strong acid and a strong base

c) small amounts of both a strong acid and a strong base

d) significant amounts of both a weak acid and a srong acid

e) significant amounts of both a weak acid and its conjugate base

3)Which of the following is true?

a) An effective buffer has a {base}/{acid} ratio in the range of 10-100

b) A buffer is most resistant to pH change when {acid} = {conjugate base}

c)An effective buffer has very small absolute concentration of acid and conjugate base

d) A buffer can not be destroyed by adding too much strong base. It can only be destroyed by adding too much strong acid.

e) None of the above are true

4) Define buffer capacity.

a)the amount of acid or base that can be added to a buffer without destroying its effectiveness

b) the amount of acid that can be added until all of the base is used up

c)the amount of base that can be added until all the acid is used up

d) the amount of acid that can be added until all the acid is used up

e) the amount of base that can be added until all the base is used up

5) Which of the following is true?

a) The equivalance point is where the amount of acid equals the amount of base during any acid-base titration

b) At the equivalance point, the pH is always 7

c) An indicator is not pH sensitive

d) A titraation curve is a plot of pH vs. the {base}/{acid} ratio

e) none of the above are true

1. c) carbonic acid and bicorbonate ion

2. b) significant amounts of both a strong acid and a strong base

3. b) A buffer is most resistant to pH change when {acid} = {conjugate base}

4.a)the amount of acid or base that can be added to a buffer without destroying its effectiveness

5.d) A titraation curve is a plot of pH vs. the {base}/{acid} ratio

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