已知25℃时有关弱电解质的电离平衡常数如下表: 弱电解质化学式CH3COOHHCNH2CO3NH3.H2O 电离平衡常数1.8×l0–54.9×l0–10K1=4.3×l0–7 K2=5.6×l0–11 1.8×l0–5 根据上表中数据回答下列问题: (1)CH3COO- 、CN- 、CO32-结合质子(即H+)的能力大小顺序_____________________;25℃时,有等浓度的①CH3COONa溶液、②NaCN溶液、③NaHCO3溶液,三种溶液的pH由大到小的顺序为 (填序号)。 (2)Na2CO3水溶液呈碱性的原因,用离子方程式表示
There is no greater love than ________ who lays down his life for his friends.
[ ]
A.
that of a man
B.
a man
C.
that of a man’s
D.
a man’s