Write ionic and net-ionic equations for each of the following molecular equations:
a) K₂S(aq) + 2 HBr(aq) + 2 KBr(aq) + H₂S(g)
b) Li HPO₄(aq) + HCl(aq) -- LiH₂PO₄(aq) + LiCl(aq)
c) NH₄Cl(aq) + NaOH(aq) ++ NH₃(aq) + NaCl(aq) + H₂O(1)