Answers
A) Aqueous solutions of potassium sulfate & barium chloride are mixed to form solid barium sulfate and aqueous potassium chloride.
Molecular: K2SO4(aq) + BaCl2(aq) ---> BaSO4(s) + 2KCl(aq)
Complete Ionic: 2K+(aq) + SO4-2(aq) + Ba2+(aq) + 2Cl-(aq) --> BaSO4(s) + 2K+(aq) + 2Cl-(aq)
Net Ionic: Ba+2(aq) + SO4-2(aq) ---> BaSO4(s)
B) Aqueous solutions of copper(II) nitrate and sodium hydroxide are mixed to form solid copper(II) hydroxide and aqueous sodium nitrate.
Molecular: Cu(NO3)2(aq) + 2NaOH(aq) ---> Cu(OH)2(s) + 2NaNO3(aq)
Complete Ionic: Cu+2(aq) + 2NO3-(aq) + 2Na+(aq) + 2OH-(aq) ----> Cu(OH)2(s) + 2Na+(aq) + 2NO3-(aq)
Net Ionic: Cu+2(aq) + 2OH-(aq) ---> Cu(OH)2(s)