1. 8. Balance the chemical equations below and then write the total ionic and net ionic equations.
Designate the state of each species by (s).1), (g) or (aq). (a) ZnCl2 (aq) + Na-CO, (aq)-? ZnC03
(s)+ NaCl (aq) total net: (b) AICI3 (aq) + NH4OH (aq) Al(OH)3 (s) NH4CI (aq) -?? total net: (c)
HCio, (aq) + Ca(OH)2 (aq)-? Ca(CIO4)2 (aq) + H2O (1) total: net: EX15-23
Solution
Ans 8 :
Start balancing the reaction sby carefully identifying the elements on each side. Then note the
atoms on each side and equate them with the ones on the other side of equation.
So here the balanced reactions are given as :
a) ZnCl2 (aq) + Na2CO3 (aq) = ZnCO3 (s) + 2NaCl (aq)
Total : Zn 2+
(aq) + 2Cl -
(aq) + 2Na +
(aq) + CO3 2-
(aq) = ZnCO3 (s) + 2Na +
(aq) + 2Cl -
(aq)
Net ionic : Zn 2+
(aq) + CO3 2-
(aq) = ZnCO3 (s)
b) AlCl3 (aq) + 3NH4OH (aq) = Al(OH)3 (s) + 3NH4Cl (aq)
Total : Al 3+
(aq) + 3Cl -
(aq) + 3NH4 +
(aq) + 3OH -
(aq) = Al(OH)3 (s) + 3NH4 +
(aq) + 3Cl -
(aq)
Net ionic : Al 3+
(aq) + 3OH -
(aq) = Al(OH)3 (s)
c) 2HClO4 (aq) + Ca(OH)2 (aq) = Ca(ClO4)2 (aq) + 2H2O (l)
Total : 2H +
(aq) + 2ClO4 -
(aq) + Ca 2+
(aq) + 2OH -
(aq) = Ca 2+
(aq) + 2ClO4 -
(aq) + 2H2O (l)
Net ionic : 2H +
(aq) + 2OH -
(aq) = 2H2O (l)