1. When copper fillings are dropped into a test tube of dilute hydrochloric acid, the copper reacts with the acid, producing bubbles of hydrogen gas and a blue-green solution of copper(II) chloride. This reaction is observed by the formation of effervescence and the change in color of the solution.
2. When copper fillings are dropped into a test tube containing dilute nitric acid, the copper reacts with the acid, producing brown fumes of nitrogen dioxide and a blue solution of copper(II) nitrate. This reaction is observed by the formation of brownish gas and the change in color of the solution.
The equation for the reaction between copper and dilute nitric acid is:
Cu + 4HNO3 -> Cu(NO3)2 + 2NO2 + 2H2O
Reaction of copper with acids.
1. Drop some copper fillings into a test tube of dilute hydrochloric acid. Describe what happens/observed.
2. Drop some copper fillings into a test tube containing dilute nitric acid.What happens/observed. Write an equation to explain the reaction.
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