(20點)f.3 chem

1.putwire gauze on the tripod and put bunsen burner under the tripod

2.put evaporating dish on the wire gauze

3.put 100cm of a salt solution into evaporating dish

4.open the bunsen burner

5.after heating.100cm of a salt solution will evaporate .only leave some salt

6.find out the salt's weight

before after

圖片參考：http://imgcld.yimg.com/8/n/HA05605475/o/701110040054813873471171.jpg