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.​

Answer 1

(a) Dilute sulphuric acid reacts with zinc granules.

When dilute sulphuric acid is poured on zinc granules, then zinc being more reactive than hydrogen displaces it from the acid and forms zinc sulphate and hydrogen gas.

$\small \textbf \red{Zn + H}_{2} \small \textbf \red{SO}_{4} → \small \textbf \red{ZnSO}_{4} + \small \textbf \red{H}_{2}$

Hydrogen is a combustible gas and burns with a popping sound. This can be observed when a match stick which is burnt is bought ear to the test tube.

(b) Dilute hydrochloric acid reacts with magnesium ribbon.

Magnesium reacts with hydrochloric acid according to the equation:

${\small\text{\bf{Mg}(s)} + 2\small\text{\bf{HCl}(aq)} →\small\textbf{MgCl}_{2}\small\text{(aq)} + \small\textbf{H}_{2}(g) }$

This demonstration can be used to illustrate the characteristic reaction of metals with acid, a single replacement reaction, or to demonstrate the generation of hydrogen gas.

(c) Dilute sulphuric acid reacts with aluminium powder.

Diluted sulfuric acid reacts with aluminium powder formed aluminium sulphate and hydrogen gas.

${ \small \textbf \green{3H}_{2}\small \textbf \green{SO}_{4} + \small \textbf \green{2Al} → \small \textbf \green{Al}_{2}\small\textbf \green{(SO4)}_{3} + \small \textbf \green{3H}_{2}}$

Answer 2

Answer:

) Dilute sulphuric acid reacts with zinc granules to produce zinc sulphate and hydrogen gas

H

2

SO

4

(aq)+Zn(s)→ZnSO

4

(aq)+H

2

(g)

(b) Dilute hydrochloric acid reacts with magnesium ribbon to produce magnesium chloride and hydrogen gas.

2HCl(aq)+Mg(s)→MgCl

2

(aq)+H

2

(g)

(c) Dilute sulphuric acid reacts with aluminium powder to produce aluminium sulphate and hydrogen gas.

3H

2

SO

4

(aq)+2Al(s)→Al

2

(SO

4

)

3

(aq)+3H

2

(g)

(d) Dilute hydrochloric acid reacts with iron filings to produce ferric chloride and hydrogen gas.

6HCl(aq)+Fe(s)→2FeCl

3

(aq)+3H

2

(g)