【单选题】下列各混合溶液,不具有对溶液pH值的缓冲能力的是( )
A.
100mL l mol•L-1HAc + 100mL 1mol•L-1NaOH
B.
100mL l mol•L-1HCl + 200mL 2 mol•L-1 NH3•H2O
C.
200mL 1 mol•L-1HAc +100mL 1mol•L-1NaOH
D.
100mL l mol•L-1NH4Cl + 100mL 1 mol•L-1 NH3•H2O
【多选题】下列各混合溶液中, ( )对溶液的pH值具有缓冲能力。
A.
100Ml lmol/L HAc + 100mL lmo1/LNaOH
B.
100mL lmol/L HCl + 200mL2mol/LNH 3 ·H 2 O
C.
200mL lmol/L HAc + 100mL 2mo1/L NaOH
D.
100mL lmol/L NH 4 Cl + 100mL lmoL/L NH 3 ·H 2 O
【简答题】选择合适的单词填空,如有必要需进行变形 备选词语: extraordinary challenging suggestion shelter ually succeed addicted energy commitment inspire 1) It's a________________job and demands great courage. 2) We...
【简答题】计算下列缓冲溶液的PH值 (1)1L溶液中 =0.10 mol , =0.10 mol (2)1L溶液中 =0.10 mol , =1.0× mol (3)1L溶液中 =1.0× mol , =0.10mol
【简答题】听下面一段材料, 回答第1至3 题. 1. What had gone wrong in their house? A. Their washing machine B. The electricity. C. The lights. 2. Which of the following is true? A. Mr. Black did nothing for them at all. B. Mr...
【单选题】在花 期控制处理阶段,应该控制施用粉料 的种类及施用量, 在花前应增施( ),可使观赏凤梨的花更大,颜色更加鲜艳。
【单选题】下列哪种方法可直接打印原理图,而不用打开打印对话框:
【单选题】下列哪种方法可直接打印原理图,而不用打开打印对话框: