Daily Quiz – AB 1

1. What does an acid do?a. Give away H+

b. Take H+

c. Give away OH-

d. Take OH-

Daily Quiz – AB 1

2. A base can do any of the following except: a. Take H+

b. Give away OH-

c. Take OH-

Daily Quiz – AB 1

3. Bronstead-Lowrey bases usually contain:a. carbonb. nitrogenc. oxygend. silicon

Daily Quiz – AB 1

4. Adding ammonia (NH3) to water increases [OH-]. Where does the oxygen come from?a. airb. waterc. ammoniad. there is no oxygen

Daily Quiz – AB 1

1. What does an acid do?a. Give away H+

b. Take H+

c. Give away OH-

d. Take OH-

Daily Quiz – AB 1

1. What does an acid do?a. Give away H+

b. Take H+

c. Give away OH-

d. Take OH-

Daily Quiz – AB 1

2. A base can do any of the following except: a. Take H+

b. Give away OH-

c. Take OH-

Daily Quiz – AB 1

2. A base can do any of the following except: a. Take H+

b. Give away OH-

c. Take OH-

Daily Quiz – AB 1

3. Bronstead-Lowrey bases usually contain:a. carbonb. nitrogenc. oxygend. silicon

Daily Quiz – AB 1

3. Bronstead-Lowrey bases usually contain:a. carbonb. nitrogenc. oxygend. silicon

Daily Quiz – AB 1

4. Adding ammonia (NH3) to water increases [OH-]. Where does the oxygen come from?a. airb. waterc. ammoniad. there is no oxygen

Daily Quiz – AB 1

4. Adding ammonia (NH3) to water increases [OH-]. Where does the oxygen come from?a. airb. waterc. ammoniad. there is no oxygen

Daily Quiz – AB 1

What is the acid ionization constant for water?

H2O

H2O

H2O

H2O ↔ H+ + OH-

H2O

H2O ↔ H+ + OH-

[OH-] [H+]

Ka = ------------------

[H2O]

H2O

H2O ↔ H+ + OH-

[OH-] [H+]

Ka = ------------------

[H2O]

H2O

H2O ↔ H+ + OH-

[OH-] [H+]

Ka = ------------------

[H2O]

Ionization Constant of Water (Kw)

H2O ↔ H+ + OH-

[OH-] [H+]

Kw = ------------------

[H2O]

Ionization Constant of Water (Kw)

H2O ↔ H+ + OH-

Kw = [OH-] [H+]

= (1.0 x 10-7) (1.0 x 10-7)

= 1.0 x 10-14

Ionization Constant of Water (Kw)

H2O ↔ H+ + OH-

Kw = [OH-] [H+]

= (1.0 x 10-7) (1.0 x 10-7)

= 1.0 x 10-14

Ionization Constant of Water (Kw)

H2O ↔ H+ + OH-

Kw = [OH-] [H+]

= 1.0 x 10-14

Ionization Constant of Water (Kw)

H2O ↔ H+ + OH-

Kw = [OH-] [H+]

= 1.0 x 10-14

Ionization Constant of Water (Kw)

H2O ↔ H+ + OH-

Kw = [OH-] [H+]

= 1.0 x 10-14

This is always true under standard conditions (298oK).

So what?

So what?So…

So what?So…if the H+ ion concentration of an aqueous solution is 1.0 x 10-5 M, what is the OH- concentration?

So what?So…if the H+ ion concentration of an aqueous solution is 1.0 x 10-5 M, what is the OH- concentration?

Is the solution acidic or basic?

So what?

Kw = [OH-] [H+]

So what?

Kw = [OH-] [H+]

(1.0 x 10-14) = [OH-] (1.0 x 10-5)

So what?

Kw = [OH-] [H+]

(1.0 x 10-14) = [OH-] (1.0 x 10-5)

(1.0 x 10-14) ----------------- = [OH-]

(1.0 x 10-5)

So what?

Kw = [OH-] [H+]

(1.0 x 10-14) = [OH-] (1.0 x 10-5)

(1.0 x 10-14) 1.0 x 10-9 = [OH-]

Is the solution acidic or basic?

Kw = [OH-] [H+]

(1.0 x 10-14) = [OH-] (1.0 x 10-5)

(1.0 x 10-14) 1.0 x 10-9 = [OH-]

Is the solution acidic or basic?

We were told: 1.0 x 10-5 = [H+]

Is the solution acidic or basic?

We were told: 1.0 x 10-5 = [H+]

We calculated: 1.0 x 10-9 = [OH-]

Is the solution acidic or basic?

We were told: 1.0 x 10-5 = [H+]

We calculated: 1.0 x 10-9 = [OH-]

[H] > [OH-]

Is the solution acidic or basic?

We were told: 1.0 x 10-5 = [H+]

We calculated: 1.0 x 10-9 = [OH-]

[H] > [OH-]

It is acidic.

Homework:Read pages 608-609Do problem 18