Answer
(a) $2Ag^+(aq) + CrO_4^{2-}(aq) --\gt Ag_2CrO_4(s)$
(b) $2H^+(aq) + MgCO_3(s) --\gt CO_2(g) + H_2O(l) + Mg^{2+}(aq)$
(c) $Hg^{2+}(aq) + 2I(aq) --\gt HgI_2(s)$
Work Step by Step
1. Write the ionic equation.
Identify the strong electrolytes, and separate their ions:
- Aqueous ionic compounds.
- Strong acids.
(a) $2Ag^+(aq) + 2NO_3^-(aq) + 2Na^+(aq) CrO_4^{2-}(aq) --\gt Ag_2CrO_4(s) + 2Na^+(aq) + 2NO_3^-(aq)$
(b) $2H^+(aq) + SO_4^{2-}(aq) + MgCO_3(s) --\gt CO_2(g) + H_2O(l) + Mg^{2+}(aq) + SO_4^{2-}$
(c) $Hg^{2+}(aq) + 2NO_3^-(aq) + 2NH_4^+(aq) + 2I(aq) --\gt HgI_2(s) + 2NH_4^+(aq) + 2NO_3^-(aq)$
2. Remove the repeated ions.
(a) $2Ag^+(aq) + CrO_4^{2-}(aq) --\gt Ag_2CrO_4(s)$
(b) $2H^+(aq) + MgCO_3(s) --\gt CO_2(g) + H_2O(l) + Mg^{2+}(aq)$
(c) $Hg^{2+}(aq) + 2I(aq) --\gt HgI_2(s)$
