举一反三
- The more the total concentration of a buffer, the more its buffer capacity at 298K.
- The more the total concentration of a buffer, the more its buffer capacity at 298K. A: 正确 B: 错误
- (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
- 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
内容
- 0
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
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(4)Buffer capacity does not represent the ability of a buffer to resist changes in pH.
- 2
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.
- 3
(4)Buffer capacity does not represent the ability of a buffer to resist changes in pH. A: 正确 B: 错误
- 4
Maybe Ma Yun hasn’t expected that Alibaba can _____ its present position in e-commerce within only 15 years.