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topic 11607

Copper Sulfate, equation for decomposition


What is the chemical equation for the decomposition of copper sulfate pentahydrate?

Sarah Mendlovitz
- Greensboro, North Carolina


The pentahydrate is 100% isolable only in temperatures lower than 30 °C. The light blue trihydrate non-isolable form can be obtained around 30°C. White monohydrate form is available at 110°C, while the anhydrous form can be isolated near 250°C. The decomposition slightly starts at 250 degrees, while complete decomposition occurs around 600 degrees...

The reaction is as follows: CuSO4 (aq) ==> SO2(g) + CuO(s)

Meriçcan Usta
Ted Ankara College - Ted Ankara College, Turkey


Hi, I'm a student at Townsville grammar school in QLD and we're doing a practical on changing copper carbonate to copper (II) sulfate and I was wondering where you got your information about copper (II) sulfate and the degrees it decomposes at;


At 30ºC the light blue tri-hydrate is formed, at 110ºC the monohydrate is formed and at 250ºC the anhydrous is formed. At 250ºC the copper sulfate slightly decomposes however it does not fully decompose till 600ºC.

thanks a lot

Courtney J.
student - Townsville, Queensland, Australia

December 6, 2008

When Copper Sulphate is analysed through TGA (Thermogravimetric analysis) it goes as per the literature by losing the water of hydration step by step.

Then, if we continue further, say at around 450 C there is sudden decrease in weight% of about 13%. So I am doubting whether it is due to decomposition of anhydrous copper sulphate or noise in TGA.

Arunagiri Sachin
- Chennai, Tamilnadu, India

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