1. The Reaction:
HCl (aq) + CH3NH2 (aq) → CH3NH3+ (aq) + Cl- (aq)
This represents the reaction of hydrochloric acid (HCl) with methylamine (CH3NH2) to form methylammonium ion (CH3NH3+) and chloride ion (Cl-).
2. Identifying Strong Electrolytes:
* HCl is a strong acid, so it completely ionizes in solution.
* CH3NH2 is a weak base, meaning it only partially ionizes in solution.
* CH3NH3+ is a weak conjugate acid and exists mostly as ions.
* Cl- is a spectator ion (it doesn't participate in the reaction).
3. The Complete Ionic Equation:
H+ (aq) + Cl- (aq) + CH3NH2 (aq) → CH3NH3+ (aq) + Cl- (aq)
4. The Net Ionic Equation:
H+ (aq) + CH3NH2 (aq) → CH3NH3+ (aq)
Explanation:
* The net ionic equation shows only the species that are directly involved in the reaction.
* The chloride ions (Cl-) are spectator ions, meaning they appear on both sides of the equation and do not change.
* This equation represents the protonation of methylamine by hydrogen ions (H+) to form the methylammonium ion (CH3NH3+).
Key Point: The net ionic equation is the most useful form of the equation as it highlights the actual chemical change occurring.
