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You can ask your own question or look at similar Chemistry questions.

If your need is to cool the system, you can consider the following options.

1. Water:  It has very good specific heat.  This means that it will take lot of heat per degree raise in temperature.  It is neutral and will not react with copper even at high temperature.

2. Ethanol:  The boiling point is very less and the rate of evaporation is high.  So it will produce cooling effect instantly. Further it is organic solvent and mostly will not react with inorganic salts 

how about water!

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