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Q: chemistry ( Answered,   0 Comments )
Subject: chemistry
Category: Science > Chemistry
Asked by: adelaziz-ga
List Price: $10.00
Posted: 19 Jun 2005 22:02 PDT
Expires: 19 Jul 2005 22:02 PDT
Question ID: 534993
how can i use thermal decomposition to prepare so3 from "caso4 gypsum "?
Subject: Re: chemistry
Answered By: till-ga on 20 Jun 2005 02:01 PDT
You will have to use rather high temperatures (sources state 700C -
1100C) to decompose CaSO4 gypsum.

"Thermal decomposition of gypsum into CaSO4 and H2O above approx: 140C (413 K)
into CaO and SO3 above approx: 700C (1273 K)"

( )

Other sources state even higher temperatures required:
"thermische Zersetzung ab ca. 1000C in Calciumoxid und Schwefeltrioxid."
thermal decomposition above appr. 1000 C into CaO and SO3
( )
(Translation by me)
Same temperture range (above 1000 C) is given in
( )

I hope this helps to solve your question.


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