aslo explain whether or not a stopper should be inserted in the top of a refulx condeser
2007-07-12 07:23:09 · 6 answers · asked by DODO 1 in Science & Mathematics ➔ Chemistry
To give maximum heat exchange between the down flowing vapour and the upflowing water which also maintains the condenser 'water full'. The condensing vapour receives its final cooling at the coolest, bottom end of the condenser.
A stopper holding a thermometer is usually placed in the top of the reflux condenser with the bulb opposite to the outlet to the main condenser to monitor temperature.
(The vapour pressure can't build up due to the vapour outlet to tne main condenser).
2007-07-13 16:01:53 · answer #1 · answered by Norrie 7 · 0⤊ 0⤋
Because the hot vapor is entering the top of the condenser and heating up the water at the top as it condenses on the inner wall. So if you pump water in the bottom, you're constantly pushing hotter water out the top.
Also, do not stopper the top of the condenser. A buildup of vapor pressure could blow the whole array apart.
2007-07-12 07:28:00 · answer #2 · answered by steve_geo1 7 · 1⤊ 0⤋
It the water inlet is from the top you will need to run the water too fast to fill the condenser. When the water runs too fast the hose can pop off when this happens the lab gets flooded. A stopper should not be placed in the top of a reflux condenser. Pressure will build and you will have a mess.
2007-07-12 07:29:14 · answer #3 · answered by Anonymous · 0⤊ 1⤋
Because then the condenser will always be filled instead of having a lot of air in it, which will ensure good contact between the water and the inner tube.
2007-07-12 07:25:54 · answer #4 · answered by Fly On The Wall 7 · 0⤊ 0⤋
1
2017-01-27 06:46:00 · answer #5 · answered by ? 3 · 0⤊ 0⤋
drochem is right,
with one note
It all comes down to efficiency. You will get better heat transfer with countercurrent flows in the condensor. And be able to condense more vapor per unit of cold water.
2007-07-12 07:50:34 · answer #6 · answered by weltenc 1 · 0⤊ 0⤋