[Extreme Experiment] When Copper + Hno3 Concentrated

What happent when copper + HNO3 concentrated?

        Nitric acid (HNO3) is an extremely important chemical used in fertilizers and explosives. It was made from ammonia by the Ostwald Process (developed in 1902 by the German chemist Wilhelm Ostwald, who got the Nobel prize in 1909). This process reacts together O2 and NH3 at 850 ° C and 5 atmospheres pressure, with the help of Platinum and Rhodium catalysts, to make NO. This is then oxidized to NO, which is then dissolved in water to make HNO3. The Ostwald process was discovered just in time for the First World War, and it contributed greatly to the extended length of that war. This is because previously Germany has no nitrate deposits of its use in artillery shells, such as TNT and nitroglycerin. In fact, most of the nitrates were available, which is the droppings of fish-eating sea birds, and are found in large quantities on the islands of the coast of Peru. When hostilities began, the shipping routes to Germany across the Atlantic were blocked, and when the process went to Germany the ability to carry on the war was longer than it would otherwise have been able.

             Copper (Cu) metal in the test tube is reacted with concentrated nitric acid (HNO3), Cu is oxidized immediately (dissolves) and the emergence of brown gas and chlorine-smelling gas and a warm tube base and blue solution color. This is because the formation of Cu (NO3) 2 where nitrate ion is a strong oxidizing agent of H + itself which causes the metal to dissolve because HNO3 is able to oxidize Cu to Cu2 + so that Cu will experience an increase in oxidation number from 0 to +2. Besides that the brown one is NO2 gas with +4 oxidation and warm test tube base due to heat / exothermic release.

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