Question

what happens when a piece of zinc is dropped in a test tube containing dilute hydrochloric acid?

Answer 1

Explanation:

This is a single displacement reaction. Zinc being more reactive than hydrogen displaces hydrogen from its solution and forms zinc chloride which is white in color and liberates hydrogen gas which is a odorless gas

Answer 2

When zinc is dropped in a test tube containing dilute hydrochloric acid, there is a formation of Zinc chloride as precipitate, and Hydrogen gas is evolved.

• The reaction can be represented as -

Zn(s) + 2HCl(aq) -----------> ZnCl₂(s) + H₂(g)

• The above reaction is a single displacement reaction
• zinc being more reactive than hydrogen displaces chloride ions from HCl to form Zinc chloride salt and the H+ ions from HCl have bonded together to form hydrogen gas.
• A dilute solution of hydrochloride acids contains H⁺ and Cl⁻ ions.
• Zinc is a metal that has a Valency of +2.
• When a piece of zinc is dropped in the dilute solution of HCl, 2 ions of chloride bond with Zn⁺² ions to form ZnCl₂.
• The above reaction is exothermic and is completed quickly.

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