Re: melting point and bubbles?

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
?
>
>
>