Acid / Base Neutralization

STRONG ACID / STRONG BASE

HCl(aq)   +   NaOH(aq)   ---------->   HOH(l)   +   NaCl(aq)   (complete formula eqn.)

H⁺(aq)   +   Cl^-(aq)   +   Na⁺(aq)   +   OH^-(aq)   ---------->   HOH(l)   +   Na⁺(aq)   +   Cl^-(aq)   (ionic eqn.)

H⁺(aq)   +   OH^-(aq)   ---------->   HOH(l)   (net ionic eqn.)

The salt in this neutralization (NaCl) is neutral.
 

weak acid / STRONG BASE

HC₂H₃O₂(aq)   +   NaOH(aq)   ---------->   HOH(l)   +   NaC₂H₃O₂(aq)   (complete formula eqn.)

HC₂H₃O₂(aq)   +   Na⁺(aq)   +   OH^-(aq)   ---------->   HOH(l)   +   Na⁺(aq)   +   C₂H₃O₂^-(aq)   (ionic eqn.)

HC₂H₃O₂(aq)   +   OH^-(aq)   ---------->   HOH(l)   +   C₂H₃O₂(aq)   (net ionic eqn.)

The salt in this neutralization (NaC₂H₃O₂) is basic.
 

STRONG ACID / weak base

H⁺(aq)   +   Cl^-(aq)   +   NH₃(aq)   ---------->   NH₄⁺(aq)   +   Cl^-(aq)   (ionic eqn.)

H⁺(aq)   +   NH₃(aq)   ---------->   NH₄⁺(aq)   (net ionic eqn.)

The salt in this neutralization is acidic.
 

weak acid / weak base

HC₂H₃O₂(aq)   +   NH₃(aq)   ---------->   NH₄⁺(aq)   +   C₂H₃O₂^-(aq)   (ionic eqn.)

HC₂H₃O₂(aq)   +   NH₃(aq)   ---------->   NH₄⁺(aq)   +   C₂H₃O₂^-(aq)   (net ionic eqn.)

The acid / base properties of the salt (NH₄C₂H₃O₂) can not be determined without quantitative data regarding the strengths of HC₂H₃O₂ and NH₃.