PP Presentation
RELATIVE STRENGTHS of ACIDS and BASES
STRONG ACIDS - react completely with water to form H3O+ (aq)
HCl (aq) + H2O ® H3O+ (aq) + Cl- (aq)
STRONG BASES - react completely with water to form OH- (aq)
Li2O + H2O ® 2 Li+ (aq) + OH- (aq)
Weak ACIDS/ weak BASES only react partially with water
- an EQUILIBRIUM is formed : the conjugate ACID and the
conjugate BASE are both present at the same time
WEAK ACID: (acetic acid a.k.a. vinegar)
CH3CO2H + H2O Û CH3CO2- (aq) + H3O+ (aq)
WEAK BASE:
NH3 (g) + H2O Û NH4+ (aq) + OH- (aq)