Using a beaker, test tube, and a hot plate. letting the liquid boil and then cool until the bubbles stop. once no more bubbles are observed, the thermometer is read.
Why is it difficult for liquids that have a boiling point over 100 degrees celcius.
2007-05-22 08:29:14 · 2 answers · asked by Franz 1 in Science & Mathematics ➔ Chemistry
It is not difficult... the only reason this may be a problem is if you are using a hot water bath to heat your test liquid, rather than heating it directly. Water boils at about 100ºC at normal pressure, so a water bath cannot heat a liquid beyond that temperature.
2007-05-22 08:47:44 · answer #1 · answered by Yuri K 3 · 1⤊ 0⤋
Yuri K.is correct. Award him full points.
For b.p.'s >100C, fill the beaker with mineral oil and heat slowly with a gas (Bunsen) burner flame. Put a thermometer in the oil. "Strap" a "large" capillary tube (about 3-4 mm o.d.), sealed at the bottom, to the thermometer with a rubber band. Put about 0.1-0.2 mL of the liquid to be tested in that tube. Put a "small"capillary tube (about 1-2 mm o.d.), sealed at the top into the liquid. Heat until you see bubbles coming out the bottom of the insidecapillary. Let cool. The liquid will be sucked into the small capillary. Start heating slowly again until you see a second bubbling. That's the boiling point.
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2007-05-22 15:58:10 · answer #2 · answered by steve_geo1 7 · 0⤊ 0⤋