Acid / Base Equilibria A Practical Application of the Principles of Equilibrium.

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Presentation transcript:

Acid / Base Equilibria A Practical Application of the Principles of Equilibrium

Water is always in equilibrium with its ions: 2H 2 O(l)   H 3 O + (aq) + OH - (aq) K W = [H 3 O + ] [OH - ] = 1.0 x (numeric value applies at 25 o C) What are the ion concentrations in pure water at equilibrium at 25 o C?

Solving the Equilibrium Equation for Water

The Concept of pH and pOH pH = - log [H 3 O + ] pOH = - log [OH - ] In pure water at 25 o C, we have the following: pH = - log (1.0 x ) = 7.00 pOH = - log (1.0 x ) = 7.00 Pure water is neutral in an acid / base sense, because the concentrations of H 3 O + and OH - are equal. At 25 o C, a value of 7.00 is neutral on both the pH and pOH scales.

The Conditions in Acidic, Basic, and Neutral Solutions Acidic: [H 3 O + ] > [OH - ] Basic: [OH - ] > [H 3 O + ] Neutral: [H 3 O + ] = [OH - ] ANY aqueous solution will contain BOTH H 3 O + ions and OH - ions. Whether the solution is acidic, basic, or neutral depends on which ion (if either) predominates.

Reaction of a Strong Acid with Water

Dissolving a Water-soluble Hydroxide Compound in Water

Reaction of a Weak Acid with Water

Reaction of a Weak Base with Water

The Hydrolysis of an Acidic Salt

Finding the Missing K a Value

The Hydrolysis of a Basic Salt