Medium
Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid,whereas copper does not. Explain why?
(N/A) In the reactivity series of metals,zinc is placed above hydrogen,which means it is more reactive than hydrogen. Therefore,zinc can displace hydrogen from dilute hydrochloric acid to form zinc chloride and hydrogen gas.
$Zn(s) + 2HCl(aq) \longrightarrow ZnCl_2(aq) + H_2(g)$
Conversely,copper is placed below hydrogen in the reactivity series,meaning it is less reactive than hydrogen. Consequently,copper cannot displace hydrogen from dilute hydrochloric acid,and no reaction occurs.
$Cu(s) + HCl(aq) \longrightarrow \text{No reaction}$
$Zn(s) + 2HCl(aq) \longrightarrow ZnCl_2(aq) + H_2(g)$
Conversely,copper is placed below hydrogen in the reactivity series,meaning it is less reactive than hydrogen. Consequently,copper cannot displace hydrogen from dilute hydrochloric acid,and no reaction occurs.
$Cu(s) + HCl(aq) \longrightarrow \text{No reaction}$
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