Question

write the molecular equations, ionic and net ionic equations for the following reactions

1. Al + HCl

2. Cu + HCl

3. Fe + HCl

4. Mg + HCl

5. Zn + HCl

6. Sn + HCl

7. Ca + HCl

Answer 1

Except for Ag+, Pb+2 and (Hg2)2+ all chloride salt are soluble, i.e the salt will remain in ionic form. Chloride ions get canceled out in each reaction being present on both sides. In all the reactions hydrogen ion is reduced to elementary Hydrogen and the metals are oxidised to their common oxidation states

1.

Molecular equation : Al (s) +3HCl (aq)$\rightarrow$ AlCl3(aq) + 3/2 H2 (g)

Ionic equation : Al 0 + 3H+(aq) + 3Cl-(aq) $\rightarrow$ Al3+(aq) + 3Cl-(aq) +3/2 H20 (g)

Net ionic equation : Al0 (s) + 3H+(aq) $\rightarrow$ Al3+(aq) + 3/2 H20 (g)

2. Molecular equation : Cu (s) +2HCl (aq)$\rightarrow$ CuCl2(aq) +   H2 (g)

Ionic equation : Cu 0 + 2H+(aq) + 2Cl-(aq) $\rightarrow$ Cu2+(aq) + 2Cl-(aq) + H20 (g)

Net ionic equation :Cu0 (s) + 2H+(aq) $\rightarrow$ Cu2+(aq) + 3/2 H20 (g)

3. Molecular equation : Fe (s) +2HCl (aq)$\rightarrow$ FeCl2(aq) + H2 (g)

Ionic equation : Fe0(s) + 2H+(aq) + 2Cl-(aq) $\rightarrow$ Fe2+(aq) + 2Cl-(aq) + H20 (g)

Net ionic equation : Fe 0 (s) + 2H+(aq) $\rightarrow$ Fe2+(aq) + H20 (g)

4. Molecular equation : Mg (s) +2HCl (aq)$\rightarrow$ MgCl2(aq) + H2 (g)

Ionic equation : Mg0(s) + 2H+(aq) + 2Cl-(aq) $\rightarrow$ Mg2+(aq) + 2Cl-(aq) + H20 (g)

Net ionic equation : Mg0 (s) + 2H+(aq) $\rightarrow$ Mg2+(aq) + H20 (g)

5. Molecular equation : Zn (s) +2HCl (aq)$\rightarrow$ ZnCl2(aq) + H2 (g)

Ionic equation : Zn0(s) + 2H+(aq) + 2Cl-(aq) $\rightarrow$ Zn2+(aq) + 2Cl-(aq) + H20 (g)

Net ionic equation : Zn0 (s) + 2H+(aq) $\rightarrow$ Zn2+(aq) + H20 (g)

6. Molecular equation : Sn (s) +2HCl (aq)$\rightarrow$ SnCl2(aq) + H2 (g)

Ionic equation : Sn0(s) + 2H+(aq) + 2Cl-(aq) $\rightarrow$ Sn2+(aq) + 2Cl-(aq) + H20 (g)

Net ionic equation : Sn0 (s) + 2H+(aq) $\rightarrow$ Sn2+(aq) + H20 (g)

7. Molecular equation : Ca (s) +2HCl (aq)$\rightarrow$ CaCl2(aq) + H2 (g)

Ionic equation : Ca0(s) + 2H+(aq) + 2Cl-(aq) $\rightarrow$ Ca2+(aq) + 2Cl-(aq) + H20 (g)

Net ionic equation : Ca0 (s) + 2H+(aq) $\rightarrow$ Ca2+(aq) + H20 (g)