hi,
From this:
The melting point of K2CO3, as measured by DTA, is 905°C in CO2 and 900°C in N2.
Of the many compounds that exist in the comprehensive K±H±C±O system, four anhydrous compounds, K2O, KHCO3, KOH, and K2CO3 are of principal
interest under ordinary ambient environments. Potassium hydrogen arbonate, KHCO3, forms under certain conditions of H2O and CO2 partial
pressures, but it decomposes rapidly between 1008 and 2008C. Potassium hydroxide, KOH, which forms under conditions of suf®cient moisture and low CO2
partial pressure, melts at 360ºC and boils at 1316ºC. K2CO3 occurs in two forms, g and b. The g phase transforms to the b form at 421ºC and the b
form is stable up to the melting point, near 900ºC.
Thermal stability of potassium carbonate near its melting point
Richard L. Lehmana,*, Jefffery S. Gentry1b, Nick G. Glumaca
a Rutgers University, Piscataway, NJ 08855, USA b RJ Reynolds, Inc., Winston-Salem, NC 27102, USA
Maybe some carbonate transformed into KOH and there was some water.
Attachment: s0040-60312900289-5.pdf (226kB)
This file has been downloaded 239 times
Go SAFE, because stupidity and bad Luck exist.
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
