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
A: 5
B: 6
C: 8
D: 9
D
举一反三
- TheKaof the conjugate acid in a buffer solution is 1.0×10-6, it is theoretically inferred that the effective buffer range of the buffer solution is A: 6~8 B: 7~9 C: 5~7 D: 5~6
- (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
- 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
- The more the total concentration of a buffer, the more its buffer capacity at 298K.
- (4)Buffer capacity does not represent the ability of a buffer to resist changes in pH.
内容
- 0
The more the total concentration of a buffer, the more its buffer capacity at 298K. A: 正确 B: 错误
- 1
(4)Buffer capacity does not represent the ability of a buffer to resist changes in pH. A: 正确 B: 错误
- 2
代码： 以下正确的说法是：（） A: buffer中所有的元素都具有初始值2。 B: buffer[1]、buffer[2]、buffer[3]的初始值是随机的。 C: buffer[1]、buffer[2]、buffer[3]的初始值是确定的，为0。 D: buffer[1]、buffer[2]、buffer[3]的初始值是确定的，但可能随编译器实现而变化。
- 3
According to the definition of buffer solution, the option that cannot form a buffer is A: HCl B: NaH2PO4 C: NaAc D: NH4Cl-NH3
- 4
（） is typically not referred to as a buffer type in critical chain project management． A: Resource buffer B: Free buffer C: Feed buffer D: Project buffer