A:Na+、K+、OH﹣、Cl﹣
B:Na+、Cu2+、SO42﹣、NO3﹣
C:Mg2+、Na+、SO42﹣、Cl﹣
D:Ba2+、HCO3﹣、NO3﹣、K+
下列实验中,①pH试纸的使用 ②过滤 ③蒸发 ④配制一定物质的量浓度溶液,均用到的仪器是( )
- These problems are too hard to . Will you give me some advice?
- There are many ways. The most important is to have a careful plan.