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)

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