Melting Point Determination
A sample in a sealed capillary, attached to a thermometer with a rubber band, is immersed in the tube. Heating is commenced, and the temperature ranges at which the sample melts can be then be observed. During heating, the point at which melting is observed and the temperature constant is the melting point of the sample. A more modern method uses dedicated equipment, known as a melting point apparatus. A slow heating rate at the melting point is needed in order to get an accurate measurement. Record the temperature on the thermometer when the sample starts to melt and record the temperature again when all of the sample has melted (this gives you the melting point range). The Thiele tube in itself has many applications such as analyzing and synthesizing organic compounds such as aspirin.
Read more about this topic: Thiele Tube
Famous quotes containing the words melting and/or point:
“Since to the awe of thy imperious wit
Our troublesome language bends, made only fit
With her tough thick-ribbed hoops to gird about
Thy giant fancy, which had proved too stout
For their soft melting phrases.”
—Thomas Carew (1589–1639)
“I stand here tonight to say that we have never known defeat; we have never been vanquished. We have not always reached the goal toward which we have striven, but in the hour of our greatest disappointment we could always point to our battlefield and say: “There we fought our good fight, there we defended the principles for which our ancestors and yours laid down their lives; there is our battlefield for justice, equality and freedom. Where is yours?””
—Anna Howard Shaw (1847–1919)