melting point determination
DESCRIPTION
Melting point determination. Why take melting point?. To help identify sample To check purity of sample. Filling sample holder. dip the open end of the capillary into dry, powdered sample several times, shoving more in each time. Packing the sample. drop the capillary - PowerPoint PPT PresentationTRANSCRIPT
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Melting point Melting point determinationdetermination
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Why take melting point?Why take melting point?
To help identify sampleTo help identify sample To check purity of sampleTo check purity of sample
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Filling sample holderFilling sample holder
dip the open end dip the open end of the capillaryof the capillary into dry, into dry,
powdered powdered samplesample
several times,several times, shoving more inshoving more in each timeeach time
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Packing the samplePacking the sample
drop the capillarydrop the capillary (closed end down)(closed end down) through a long through a long
glass tubeglass tube several timesseveral times until sample isuntil sample is compacted at the compacted at the
bottombottom
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Turn machine on, andTurn machine on, andset resistor for temp rangeset resistor for temp range
ON buttonON button indicated indicated by white arrow.by white arrow. Set dial Set dial to expected to expected
melting range melting range
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How to determine the right How to determine the right settingsetting
This chart shows This chart shows heating curves heating curves at various settings. at various settings. For accurate m.p.For accurate m.p. determinationdetermination the expected m.p.the expected m.p. is on the flat is on the flat part of the curvepart of the curve
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Taking m.p.Taking m.p.
Turn onTurn on the digitalthe digital thermometerthermometer
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Taking m.p.Taking m.p.
insertinsert up to 3up to 3 samplessamples
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Wait forWait for and watchand watch samples melt.samples melt. RecordRecord melting rangemelting range