举一反三
- Regarding the determination of the effective buffer range of the buffer solution, which of the following is not the factor we should consider A: pH= pKa±1 B: The buffer ratio is between 0.1 and 10 C: Large buffer capacity D: High total concentration
- (3)Choose the factors that can not determine the capacity of a buffer from the following a. pH of the buffer b. Concentration of buffer-component reservoirsc. Buffer-component ratio d. Buffer range A: a B: b C: c D: d
- (5)The more concentrated the components of a buffer, the greater the buffer capacity. A: 正确 B: 错误
- (4)Buffer capacity does not represent the ability of a buffer to resist changes in pH.
- A buffer can only sustain its pH within its buffer capacity.
内容
- 0
(4)Buffer capacity does not represent the ability of a buffer to resist changes in pH. A: 正确 B: 错误
- 1
A buffer solution must contain a relatively large concentration of acid and a similar concentration of base.
- 2
What is the pH of a buffer with the largest buffer capacity when the buffer is composed of NH3 (Kb = [img=80x24]1803a221c94490b.png[/img]) and HCl? A: 5 B: 6 C: 8 D: 9
- 3
The larger the value of β，the greater the capacity of the buffer to resist changes in pH.
- 4
Which is the correct description of a pinned buffer in the database buffer cache（） A: The buffer is currently being accessed. B: The buffer is empty and has not been used. C: The contents of the buffer have changed and must be flushed to the disk by the DBWn process. D: The buffer is a candidate for immediate aging out and its contents are synchronized with the block contents on the disk.