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  • Copper is a noble metal, and as such is very hard to corrode or dissolve. the reason that hydrogen peroxide is used in this reaction is because the hydrochloric acid cannot directly attack the copper metal. hydrogen peroxide can attack copper rendering copper hydroxide, after which the acid can protonate the hydroxide creating water and a salt of copper chloride. this process requires no heat as the creation of the hydroxide is fairly exothermic and follows the equation :H2O2 + Cu --> Cu(OH)2 Cu(OH)2 + 2HCl --> CuCl2 + 2(H2O)Furthermore you can create copper chloride by just bubbling air through a vessel that contains both metallic copper and hydrochloric acid with no heat needed following the equation: O2+4HCl+2Cu --> 2(CuCl2)+2(H2O) I would also like to state that i have no b...see more »Copper is a noble metal, and as such is very hard to corrode or dissolve. the reason that hydrogen peroxide is used in this reaction is because the hydrochloric acid cannot directly attack the copper metal. hydrogen peroxide can attack copper rendering copper hydroxide, after which the acid can protonate the hydroxide creating water and a salt of copper chloride. this process requires no heat as the creation of the hydroxide is fairly exothermic and follows the equation :H2O2 + Cu --> Cu(OH)2 Cu(OH)2 + 2HCl --> CuCl2 + 2(H2O)Furthermore you can create copper chloride by just bubbling air through a vessel that contains both metallic copper and hydrochloric acid with no heat needed following the equation: O2+4HCl+2Cu --> 2(CuCl2)+2(H2O) I would also like to state that i have no background in chemistry and this is correct to the best of my knowledge. i have personally only used the peroxide method as the bubbling method takes far longer.

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