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CHEM 343 QUIZ 2 Questions and and answers (1)
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CHEM 343 QUIZ 2 Questions and and answers (1)
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CHEM 343 QUIZ 2-- ✅✅-✰ BOILING POINT ✰
• the temperature at which the VAPOR PRESSURE of the liquid equals the
ATMOSPHERIC PRESSURE
✰ BOILING POINT ✰
✅✅
• the temperature at which the VAPOR PRESSURE of the liquid equals the
ATMOSPHERIC PRESSURE - -✰ BOILING POINT ✰
• the temperature at which the _________ of the liquid equals the _________
✅✅
the temperature at which the VAPOR PRESSURE of the liquid equals the
ATMOSPHERIC PRESSURE - -What is the boiling point of a liquid?
✅✅
1) to allow more SECURE clamping of the thermometer
2) the thermometer could SNAP - -1) What is the purpose of the thermometer
adapter?
2) What could happen if the adapter were not used?
-- ✅✅-✰ MICROSCALE METHOD (SIWOLOBOFF'S METHOD) ✰
1) Take a small test tube, strap it to a thermometer with a rubber band, and put ≈4-5
drops of your unknown into the test tube
2) Insert a melting-point capillary tube into your test tube OPEN END DOWN into
your unknown
3) Clamp the thermometer so that the thermometer bulb, the test tube, and the
open-end-down melting-point capillary in it are ALL in a WATER bath on top of a
HOT PLATE
4) As you heat your unknown, you will notice the AIR in the CAPILLARY EXPAND,
and a very SLOW stream of BUBBLES will start to escape the CAPILLARY as the air
leaves it
5) At some point, the BUBBLES will stream FASTER as the LIQUID UNKNOWN
begins to BOIL
6) After A WHILE, remove the heat
7) Allow your boiling liquid to COOL
8) AS SOON AS THE UNKNOWN LIQUID enters the CAPILLARY, read the
thermometer to obtain the FIRST value of the boiling range
9) When the unknown liquid FILLS the tube, read the thermometer AGAIN to obtain
the SECOND value of the boiling range
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