相关离子生成氢氧化物的pH和相关物质的溶解性如下表:
金属离子
开始沉淀pH
沉淀完全pH
物质
20℃溶解性(H2O)
Fe3+
1.1
3.2
CaSO4
微溶
Fe2+
5.8
8.8
NiF2
可溶
Al3+
3.0
5.0
CaF2
难溶
Ni2+
6.7
9.5
NiCO3
Ksp=9.6×10-6
Dear Jenny,
Now we are in the hospital of our city . My mother and I have a bad cold . We sees many children here . Some people have a cold. Some people have a headache. Some people have a fever. They a re waiting outside the doctor's room .Now it's our turn.
Yours,
Jack
It is reported that a new shopping mall will be built in ________ was farmland decade ago.
下列各组物质中,前者属于化合物,后者属于混合物的是
东南亚最大的国家是( )
2001年5月,台湾传出“毒饮料事件”,一些厂商在饮料中违法添加了“塑化剂”。塑化剂的主要成分为邻苯二甲酸二辛酯,其化学式为C24H38O4.下列说法中正确的是()