Jawapan

2016-07-27T21:54:40+08:00
This is how a conical flask looks like.

Procedure...

1.Begin by selecting the appropriately sized flask for your procedure.
2.Calculate and measure the mass of solid material needed to prepare the desired solution.
3.Next, transfer the material into the flask, using a funnel to assure no material is lost during transfer.
4.Rinse the sides of the funnel with your solvent (e.g. water for aqueous solutions) down into the flask to capture any residual material adhering to the funnel.
5.Next, fill the flask about halfway with your solvent, cap the flask and swirl to dissolve the solid material into solution.
6.Once the solid material has been dissolved, fill the flask with your solvent almost to the etched line.
Pause and let any liquid drain down from the sides of the flask.
7.Next, use a medicine dropper to carefully add enough solvent to raise the base of the meniscus of the solution to the level of the etched line.
8.Finally, cap, mix, swirl and store your prepared solution until ready to use.

2016-07-28T19:36:42+08:00
conical flask: Erlenmeyers are used to store solutions and t o contain reactions, especially titrationsĀ