Acid-Base Behavior

A Tutorial Review

CHM 1020/Sinex

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Electrolyte behavior

undissociated ions from dissociation

a b c

Which box illustrates a non-electrolyte?

Which box illustrates a strong electrolyte?

Which box illustrates a weak electrolyte?

Acid-base behaviorLet’s consider acids where HA dissociates into H+ and A-.

HA H+ A-

HCl (g) H+ (aq) + Cl- (aq)H2O

So in this example based on electrolyte behavior,

HCl would be considered a acid.

a b c

Let’s consider acids where HA dissociates into H+ and A-.

HA H+ A-

Acid-base behavior 2

So which box illustrates a weak acid with a partial dissociation?

Acid-base behavior 3Rank the following weak acids from weakest (1) to strongest (3)

HA H+ A-

Rank them from lowest (1) to highest (3) pH

B H2O BH+ OH-

Acid-base behavior 4

Now let’s consider the behavior of a weak base

a b

Which box contains the weaker base?

Which box the highest pH?

Acid-base behavior 5

Most acid dissociation reactions are endothermic.

HA H+ A-

So which box illustrates the weak acid at the lowest temperature?

a b c

Acid-base behavior 6

The degree of dissociation influences the conductivity of the solution.

HA H+ A-

So which box illustrates the most conductive solution?

a b c

HA H+ A-

Acid-base behavior 7

What happens if you add strong acid or strong base to the weak acid?

Add strong acid Add strong base

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