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Melting point determination

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

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Melting point determination

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  1. Melting point determination

  2. Why take melting point? • To help identify sample • To check purity of sample

  3. Filling sample holder • dip the open end • of the capillary • into dry, powdered sample • several times, • shoving more in • each time

  4. Packing the sample • drop the capillary • (closed end down) • through a long glass tube • several times • until sample is • compacted at the bottom

  5. Turn machine on, andset resistor for temp range • ON button • indicated • by white arrow. • Set dial • to expected melting range

  6. How to determine the right setting • This chart shows • heating curves • at various settings. • For accurate m.p. • determination • the expected m.p. • is on the flat • part of the curve

  7. Taking m.p. • Turn on • the digital • thermometer

  8. Taking m.p. • insert • up to 3 • samples

  9. Wait for • and watch • samples melt. • Record • melting range

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