Filtration in Chemical Laboratory

Filtration in Chemical Laboratory
1. "One paste two low three lean" and "one paste": filter paper is close to the inner wall of funnel
2. "Two low": (1) the edge of filter paper is lower than that of funnel orifice (2) the liquid level in funnel is lower than that of filter paper.

3. "Three leanings": (1) The nozzle of the lower end of the funnel is close to the inner wall of the beaker; (2) When the glass rod is used for drainage, the lower end of the glass rod is light on one side of the three-layer filter paper; (3) When the glass rod is used for drainage, the beaker tip is close to the middle part of the glass rod after filtration, the filtrate is still turbid because: (1) the beaker that receives the filtrate is not clean; (2) dumping. The liquid level is higher than the edge of the filter paper when it is liquid. 3. The filter paper is damaged.