Net Ionic equations

Question

a. Write a net ionic equation for the reaction that occurs when aqueous solutions of hypochlorous acid and barium hydroxide are combined.

b. Write a net ionic equation for the overall reaction that occurs when aqueous solutions of phosphoric acid and potassium hydroxide are combined. Assume excess base.

Answer 1

Lets start with the formula equation which helps inform us as to what will dissociate and what will not

HClO (aq) + Ba(OH)2 (aq) --> Ba(ClO)2 (aq) + H2O

This assumes the barium hydrozide is in solution. If so the NIE willl be:

HClO + OH-1 --> ClO-1 + H2O

If the barium hydroxide is solid nothing will cancel as spectotor ions and the final NIE is simply:

HClO + Ba(OH)2 --> Ba+2 + ClO-1 + H2O

H3PO4 + KOH --> K3PO4 + H2O

again assuming both are in solution - it is improtant that the question states excess base that leads us to react all the acid leaving no H with the phosphate

NIE is then

H3PO4 + OH-1 --> PO4-3 + H2O