Second Year College Chemistry a Manual of Laboratory Exercises
Second Year College Chemistry a Manual of Laboratory Exercises
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A Biichner funnel (9 cm. ) set up according to Fig. 19. This funnel has a perforated bottom over which a filter paper is placed. It is always used with suction, like a Gooch crucible, and is thus a great time-saver when large volumes of liquids are to be filtered. If the volume of liquid is small it is well to receive it in a large test-tube placed inside the suction flask.
Procedure. Place 25 gm. Of anhydrous sodium sulphate in a casserole, add 40 cc. Of water, and heat gently, stirring consta...ntly with a thermometer, until the temperature reaches about 40 C. Main- tain this temperature until most of the salt dis- solves, and any possible traces of the hydrated phases are destroyed. The small amount of pow- dered material left over is the anhydrous salt. (Would this dissolve if the temperature were raised?) FIG 19. Filter immediately on a Biichner, making sure beforehand that the apparatus is perfectly free from any traces of the hydrated salts, or any salt, in fact. When this is done, return the solution to the casserole (carefully rinsed) and again heat to 40 C.
What to read after Second Year College Chemistry a Manual of Laboratory Exercises?
You can find similar books in the "Read Also" column, or choose other free books by William H William Henry Chapin to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
A Biichner funnel (9 cm. ) set up according to Fig. 19. This funnel has a perforated bottom over which a filter paper is placed. It is always used with suction, like a Gooch crucible, and is thus a great time-saver when large volumes of liquids are to be filtered. If the volume of liquid is small it is well to receive it in a large test-tube placed inside the suction flask.
Procedure. Place 25 gm. Of anhydrous sodium sulphate in a casserole, add 40 cc. Of water, and heat gently, stirring consta...ntly with a thermometer, until the temperature reaches about 40 C. Main- tain this temperature until most of the salt dis- solves, and any possible traces of the hydrated phases are destroyed. The small amount of pow- dered material left over is the anhydrous salt. (Would this dissolve if the temperature were raised?) FIG 19. Filter immediately on a Biichner, making sure beforehand that the apparatus is perfectly free from any traces of the hydrated salts, or any salt, in fact. When this is done, return the solution to the casserole (carefully rinsed) and again heat to 40 C.
What to read after Second Year College Chemistry a Manual of Laboratory Exercises?
You can find similar books in the "Read Also" column, or choose other free books by William H William Henry Chapin to read onlineMoreLess
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