Register to reply

Thermal decomposition of calcium carbonate...?

by makky2008
Tags: calcium, carbonate, decomposition, thermal
Share this thread:
makky2008
#1
Feb9-14, 06:59 PM
P: 2
In general, we heat CaCO3 to temperature of approximately 825C it decomposes into calcium oxide and liberates carbon dioxide gas:

CaCO3 →825C→ CaO + CO2

Is it possible to heat the calcium carbonate at temperatures below 825 degrees Celsius, so the decomposition into calcium oxide.
Phys.Org News Partner Chemistry news on Phys.org
Mineral magic? Common mineral capable of making and breaking bonds
Seeing is bead-lieving: Scientists create model 'bead-spring' chains with tunable properties
New molecule puts scientists a step closer to understanding hydrogen storage
Borek
#2
Feb9-14, 08:01 PM
Admin
Borek's Avatar
P: 23,385
Quote Quote by makky2008 View Post
Is it possible to heat the calcium carbonate at temperatures below 825 degrees Celsius
Sure, you can heat it to any temperature you want

so the decomposition into calcium oxide.
Please translate into English, no idea what you were trying to ask.
SteamKing
#3
Feb10-14, 11:30 AM
Emeritus
Sci Advisor
HW Helper
Thanks
PF Gold
P: 6,319
If the OP is asking if calcium carbonate will decompose at a temp. below 825 C, the answer is no.

See this article:

http://en.wikipedia.org/wiki/Calcination

This type of decomposition occurs only at temperatures above which the Gibbs free energy is zero. Certainly, if this reaction could occur at lower temps., the cement and lime industry would be all over it.

Borek
#4
Feb10-14, 02:34 PM
Admin
Borek's Avatar
P: 23,385
Thermal decomposition of calcium carbonate...?

This is slightly more complicated, 825 C is probably for a standard state, when the partial pressure of CO2 is expected to be 1 atm.
makky2008
#5
Feb10-14, 02:37 PM
P: 2
Thank you very much Mr.Borek and SteamKing.


Register to reply

Related Discussions
Calcium Carbonate -> Calcium Oxide, but only getting Hydroxide. Ideas? Chemistry 4
Calcium Carbonate Phases Advanced Physics Homework 1
Reactions of calcium carbonate Chemistry 14
General formula for Calcium carbonate Chemistry 1
Calcium Carbonate CaCO3 Biology, Chemistry & Other Homework 2