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calcined alumina is Al2O3 and alumina hydrate is Al2O3. 3H2O. It's difference in the molecule structure.

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Q: What is difference between calcined alumina and alumina hydrate?
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What is the difference between alumina hydrate and alumina trihydrate?

Nothing... Alumina hydrate has many names, alumina trihydrate being one of them. The other names are as follows: Aluminum hydrate; Aluminum trihydrate; Aluminum (III) hydroxide; Amorphous alumina; Trihydroxyaluminum


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