Question

4.
Explain reactions of sodium, magnesium and iron
with water.​

Answer 1

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Reaction of Sodium with water:-

• Sodium metal reacts rapidly with water to form a colourless solution of sodium hydroxide (NaOH) and hydrogen gas (H2). Equation is as follows:-
• 2 Na ( s ) + 2 H2O ( l ) 2 NaOH ( aq ) + H2 ( g )

Reaction of Magnesium with water:-

• Magnesium burns in steam to produce white magnesium oxide and hydrogen gas. Very clean magnesium ribbon has a very slight reaction with cold water. After several minutes, some bubbles of hydrogen form on its surface, and the coil of magnesium ribbon usually floats to the surface . Equation for reaction is:-
• Mg + H2O = MgO + H2

Reaction of Iron with Water:-

• iron metal reacts in moist air by oxidation to give a hydrated iron oxide. This does not protect the iron surface to further reaction since it flakes off, exposing more iron metal to oxidation. Equation for reaction is:-
• 3Fe + H2O = Fe3O4 + 4H2(g)

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