Question

For which one of the pairs of acids and bases does the following represent the net ionic equation?

H3O+ +OH- ___ 2H2O a NaOH, HBr b CH3COOH, Ca(OH)2 c HNO3, Mg(OH)2 d CH3COOH, Cu(OH)2 e CH3COOH, Cr(OH)3

Answer 1

                                                        H₃O⁺ +OH^-       -------->       H₂O + H₂O

a) HBr + NaOH → NaBr + H₂O

Net ionic: H⁺ + OH^- → H₂O

b) Ca(OH)2 + 2 CH3COOH → 2 H2O + Ca(CH3COO)2

Net ionic: 2 OH- (aq) + 2 H+ (aq) --> 2 H2O (l)

c) 2 HNO₃ + Mg(OH)₂ → 2 H₂O + Mg(NO₃)₂

Net ionic: 2 OH- (aq) + 2 H+ (aq) --> 2 H2O (l)

d) Cu(OH)₂ + 2CH₃COOH → Cu(CH₃COO)₂ + 2H₂O

Net ionic: 2 OH- (aq) + 2 H+ (aq) --> 2 H2O (l)

e) Cr(OH)₃ + 3CH₃COOH → Cr(CH₃COO)₃ + 3H₂O

Net ionic: 3 OH- (aq) + 3 H+ (aq) --> 3 H2O (l)

So

a) NaOH, HBr

This pair represents the above net ionic equation.