### Chapter 2: Acids, Bases and Salts

Q
##### Acids,Bases, and Salts

Question:

Write word equations and then balanced equations for the reaction taking place when:

(a) dilute sulphuric acid reacts with zinc granules

(b) dilute hydrochloric acid reacts with magnesium ribbon

(c) dilute sulphuric acid reacts with aluminium powder

(d) dilute hydrochloric acid reacts with iron filing

(a)- When dilute sulphuric acid reacts with zinc granules, zinc sulphate is formed along with the evolution of hydrogen gas. The chemical equation for this reaction is written as:

H2SO4 (aq) + Zn (s) → ZnSO­­4 (aq) + H2 (g)

The number of atoms of different elements present in the given unbalanced equation is as follows: The number of atoms of each element is the same in reactant as in product. Thus, it is a balanced chemical equation.

Therefore, the correct answer is H2SO4(aq) + Zn(s) → ZnSO4(aq) + H2(g).

(b)- When dilute hydrochloric acid reacts with magnesium ribbon, magnesium chloride will form along with the evolution of hydrogen gas. The chemical equation for this reaction is written as:

HCl (aq) + Mg (s) → MgCl­2 (s) + H2 (g)

The number of atoms of different elements present in the given unbalanced equation is as follows: Balance hydrogen and chlorine by multiply 2 in the reactant side as shown below:

2 HCl (aq) + Mg (s) → MgCl­2 (s) + H2 (g)

The number of atoms of different elements present in the given balanced equation is as follows: The number of atoms of each element is the same in reactant as in product. Thus, it is a balanced chemical equation.

Therefore, the correct answer is 2HCl(aq) + Mg(s) → MgCl2(s) + H2(g).

(c)- When sulphuric acid reacts with aluminium powder, aluminium sulphate will form along with the evolution of hydrogen gas. The chemical equation for this reaction is written as:

H2SO4 (aq) + Al (s) → Al2(SO4)3 (aq) + H2 (g)

The number of atoms of different elements present in the given unbalanced equation is as follows: First, balance oxygen by multiply 3 in the reactant side as shown below:

3 H2SO4 (aq) + Al (s) → Al2(SO4)3 (aq) + H2 (g)

Now, balance hydrogen by multiply 3 in the product side.

3 H2SO4 (aq) + Al (s) → Al2(SO4)3 (aq) + 3 H2 (g)

The aluminium atom is balanced by multiplying 2 in the reactant side as shown below.

3 H2SO4 (aq) + 2 Al (s) → Al2(SO4)3 (aq) + 3 H2 (g)

The number of atoms of different elements present in the given balanced equation is as follows: The number of atoms of each element is the same in reactant as in product. Thus, it is a balanced chemical equation.

Therefore, the correct answer is 3H2SO4(aq) + 2Al(s) → Al2(SO4)3(aq) + 3H2(g)

(d)- When dilute hydrochloric acid reacts with iron filling, ferric chloride will form along with the evolution of hydrogen gas. The chemical equation for this reaction is written as:

HCl (aq) + Fe (s) → FeCl3 (s) + H2 (g)

The number of atoms of different elements present in the given unbalanced equation is as follows: First, balance chlorine by multiply 6 in the reactant side and 2 in the product side as shown below:

6 HCl (aq) + Fe (s) → 2 FeCl3 (s) + H2 (g)

Now, balance hydrogen by multiply 3 in the product side as shown below:

6 HCl (aq) + Fe (s) → 2 FeCl3 (s) + 3 H2 (g)

Lastly, balance iron by multiply 2 in the reactant side as shown below.

6 HCl (aq) + 2 Fe (s) → 2 FeCl3 (s) + 3 H2 (g)

The number of atoms of different elements present in the given balanced equation is as follows: The number of atoms of each element is the same in reactant as in product. Thus, it is a balanced chemical equation.

Therefore, the correct answer is 6HCl(aq) +2Fe(s) → 2FeCl3(s) + 3H2(g).

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