Demonstrations › tastecraftedmcd.comical Reactions II › 5.2
tastecraftedmcd.comical Reactions II: Oxidation/Reduction
5.2 Oxidation of Zinc by Hydrochloric Acid
You are watching: When zinc metal is mixed with hydrochloric acid what is produced
Description: Observation of the oxidation of zinc metal by hydrochloric acid to form hydrogen gas and zinc chloride.
Materials:Mossy zinc (1 piece) 1 M Hydrochloric acid, HCl‡ Petri dish Tweezers Flask (optional) Balloons (optional)
‡HCl is located in the cabinet under the hood.
Procedure A: Note: Use the demo camera for displaying the reaction in ISB135.Add a small amount of HCl to the Petri dish or flask. Add a small piece of zinc metal to the HCl and observe the reaction. Hydrogen gas will be produced.
Optional: Put a balloon over the flask opening to collect the gas. Ignite the balloon.
Discussion: Zinc is oxidized by hydrochloric acid to form zinc chloride. In the process, hydrogen gas is produced. The reaction is given below.
Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)
Zn(s) + 2H+ → Zn2+(aq) + H2(g)(Net ionic equation)
Safety: HCl and zinc chloride are corrosive and can cause skin irritations or burns. Wear appropriate protective equipment, including gloves and safety glasses.
Disposal: Solutions of zinc chloride should be disposed in appropriate hazardous waste container.
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References: For a more thorough description and variations see:
1. B.Z. Shakhashiri; tastecraftedmcd.comical Demonstrations: A Handbook for Teachers of tastecraftedmcd.comistry; Wisconsin; 1985; Volume 1; p. 25-26.