Question

Compare the activity of sodium and iron with water and dillute acids

Answer 1

Answer:

Sodium reacts fairly violently with water. Hydrogen gas is generated, which can be observed in the formation of bubbles in the solution. Another indicator a reaction occurs is the change in the pH. Initially, the water has a pH of 7, which is neutral. In addition to hydrogen being generated sodium hydroxide is generated, which is a base. The pH of the resulting solution will be greater than 7. The equation for this reaction is:

2Na (s) + 2H2 O (l) → 2NaOH (aq) + H2 (g)

Let's see how sodium reacts with oxygen.

Elemental sodium does react with oxygen, which is why it has to be stored in special oil. The reaction with sodium and oxygen is:

4Na (s) + O2 (g) → 2Na2 O (s)

There is also a transfer of electrons in this reaction from the sodium atoms to the oxygen atoms. When sodium reacts with oxygen it turns a yellowish color.

Yellow light from a sodium lamp

sodium

We have discussed a highly reactive metal's reaction with a dilute acid, water, and oxygen. Will a less reactive metal react the same way with these substances? Let's find out!

Answer 2

The activity of sodium with water:

• The sodium reacts with water very effortlessly. It responds with water to provide a solution of sodium hydroxide and hydrogen gas with a large quantity of heat. The reaction is highly exothermic. The hydrogen gas existing vapour in nature developed easily and the resultant is the solution of sodium hydroxide.

The activity of sodium with dilute acid:

• When sodium replies with dilute hydrochloric acid, then sodium chloride is constructed and hydrogen gas evolves.

The activity of iron with water:

• The commodities of the chemical reaction that occurred between the iron metal and water vapour are iron (III) oxide and hydrogen gas.

The activity of iron with dilute acids:

• Iron(II) chloride and hydrogen gas are developed when dilute Hydrochloric acid is inaugurated to iron filings. Iron displaces hydrogen from hydrochloric acid in this procedure, occurring in iron chloride and hydrogen gas.

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