How does silica dissolve?
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Silicon dioxide decomposes into an entropy increasing reaction, which should be able to decompose as long as the temperature is high enough.
Firstly, consider decomposing into elemental and oxygen
It can be decomposed at around 2750K.
Further consider decomposing into silicon monoxide and oxygen.
At around 2980K, it decomposes into silicon monoxide and oxygen.
But silicon monoxide is not very stable either
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In summary, silicon dioxide will decompose, and the decomposition products are elemental silicon and oxygen, with a decomposition temperature of around 2750K.
