Re: melting point and bubbles?

Actually, what about if the product decomposes at the melting point area?

"CJ" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> Hi,
>
> if you don't get a definite mp within a degree or so then it means that
> your unknown is either impure or a mixture of 2 or more compounds.
>
> CJ
>
>
> "information_person" <[EMAIL PROTECTED]> wrote in message
> news:[EMAIL PROTECTED]
> > Using capillary method for determining melting point the unknown
> > substance started to slowly clump and melt at X degree C, at about 3
> degree
> > higher it was one clumped ball (like snow balls)., however
> > at a specific temperature about 7 degree C higher than the first
> observed
> > melting the material appeared slushy, with most/all of the slush (that
> > appears
> > like small spherical crystals or small trapped bubbles) floated to the
> > top 1/2 of the mixture within the capillary tube.  At first it appears
> > like crystal, but most likely the slush are trapped bubbled of some
> > kind on the top of the clear melted liquid.
> >
> > Anyway after heating 30 degree past the initial melting point
> > there was no changes in the top 1/2 of the mixture which still
> appeared
> > like bubbles/slush.  Thus my question to you is:
> >
> > I thought the entire thing would melt to clarity, there must be
> > decomposition
> > going on somehow....
> >
> > Are the tiny bubbles normal ?  If I know the starting melting point,
> but
> > don't
> > have a final number is this acceptable ?  What is really going on here
> ?
> >
> >
> >
>
>