Describe what happens when iron fillings is added to dilut hydrochloric acid.

Answer 1

When iron filings are added to dilute hydrochloric acid (HCl), a chemical reaction occurs. The iron (Fe) undergoes a displacement reaction with the hydrogen (H) in the hydrochloric acid. The reaction can be represented by the following equation:

Fe(s) + 2HCl(aq) → FeCl2(aq) + H2(g)

In this reaction, the iron reacts with the hydrochloric acid to form iron chloride (FeCl2) and hydrogen gas (H2). The iron filings dissolve in the acid, and the solution turns yellow-greenish due to the formation of the iron chloride compound. The hydrogen gas is released as bubbles and rises to the surface.

It is important to note that this reaction happens only with dilute hydrochloric acid and not with all acids. Dilute hydrochloric acid is commonly used for these types of reactions because it is a strong acid and can readily react with metals to form metal chlorides.

Overall, the addition of iron filings to dilute hydrochloric acid results in the production of iron chloride and hydrogen gas.

Answer 2

What is the color of the solution when the reaction stops

Answer 3

When the reaction between iron filings and dilute hydrochloric acid comes to a halt, the color of the solution tends to become colorless or pale yellow. Initially, when iron reacts with hydrochloric acid, the yellow-greenish color of the iron chloride formed can make the solution appear colored. However, as the reaction progresses and all the iron is consumed, the solution loses its color and becomes clear or slightly yellow, depending on the concentration of the iron chloride present.

Answer 4

Have Fe2+ or Fe 3+ formed?

Answer 5

In the reaction between iron filings and dilute hydrochloric acid, Fe2+ ions (iron in its +2 oxidation state) are formed. This is because iron filings (Fe) react with hydrochloric acid (HCl) and displace hydrogen (H), resulting in the formation of iron chloride (FeCl2). In FeCl2, each iron ion has a +2 charge, indicating the presence of Fe2+ ions.

It is important to note that the oxidation state of iron can vary in different chemical reactions and compounds. In this specific reaction with hydrochloric acid, Fe2+ ions are formed.