Question

Magnesium. aluminium, zinc and iron were put in different test tubes containing dilute
hydrochloric acid. In which test tube will the rate of formation of bubbles of hydrogen gas be
fastest and why?​

Answer 1

Explanation:

Given:-

• Magnesium. aluminium, zinc and iron were put in different test tubes containing dilute hydrochloric acid.

To find:-

The fastest rate of reactivity of the following metals.

Let's Learn!

Do you reckon the reactivity series? A brief note here :-

1. K Pottasiun
2. Na Sodium
3. Ca Calcium
4. Mg Magnesium
5. Al Alumunium
6. Zn Zinc
7. Fe Iron
8. Sn Tin
9. Pb Lead
10. H Hydrogen
11. Cu Copper
12. Au Silver
13. Ag Gold
14. Pt Platinum

Now, if we move according to the table, the highest reacting metal is Magnesium.

So, Formation of bubbles is fast because it is highly reactive and also, produces bubbles of Hydrogen.

Remember:-

Magnesium does not react with cold water but with hot water, it reacts.

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Answer 2

Reactions of metals with acids:-

Dilute acids react with relatively reactive metals such as magnesium, aluminium, zinc and iron. The products of the reaction are a salt plus hydrogen gas.

metal + acid → salt + hydrogen

Here’s a good way to remember it: MASH (M+A→S+H).

The name of the salt depends on the name of the acid. For example:

magnesium + hydrochloric acid → magnesium chloride + hydrogen

Mg + 2HCl → MgCl2 + H2

zinc + sulfuric acid → zinc sulfate + hydrogen

Zn + H2SO4 → ZnSO4 + H2

In general, the more reactive the metal, the faster the reaction. However, aluminium has a protective oxide layer, so it reacts slowly with acids to begin with.