Yesterday’s Homework. The concentration of either the H + ion or the OH - ion is given for three aqueous solutions at 298 o K. For each solution, calculate.

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Presentation transcript:

Yesterday’s Homework

The concentration of either the H + ion or the OH - ion is given for three aqueous solutions at 298 o K. For each solution, calculate [H + ] or [OH - ]. State whether the solution is acidic, basic, or neutral.

Yesterday’s Homework If this wasn’t easy, you’re doing it wrong.

Yesterday’s Homework [H + ] = 1.0 x M

Yesterday’s Homework [H + ] = 1.0 x M [OH - ] = 1.0 x M

Yesterday’s Homework [H + ] = 1.0 x M [OH - ] = 1.0 x M basic

Yesterday’s Homework [OH - ] = 1.0 x M

Yesterday’s Homework [OH - ] = 1.0 x M [H + ] = 1.0 x M

Yesterday’s Homework [OH - ] = 1.0 x M [H + ] = 1.0 x M neutral

Yesterday’s Homework [OH - ] = 1.0 x M

Yesterday’s Homework [OH - ] = 1.0 x M [H + ] = 1.0 x M

Yesterday’s Homework [OH - ] = 1.0 x M [H + ] = 1.0 x M basic

Yesterday’s Homework Any questions?

Daily Quiz Questions

1. What is true of [H + ] and [OH - ]? a. [H + ] = [OH - ] b. [H + ] x [OH - ] = 1 x c. [H + ] ÷ [OH - ] = 1 x d. [H + ] x [OH - ] = 1 x e. [H + ] ÷ [OH - ] = 1 x

Daily Quiz Questions 2. In a neutral solution, pH = a. 0 b. 0.5 c. 1 d. 7 e. 14

Daily Quiz Questions 3. 1 x = ? a. 5 b. 100,000 c ,01 d ,001

Daily Quiz Questions 4. Which number is bigger? a. 1 x b. 1 x

Daily Quiz Questions 1. What is true of [H + ] and [OH - ]? a. [H + ] = [OH - ] b. [H + ] x [OH - ] = 1 x c. [H + ] ÷ [OH - ] = 1 x d. [H + ] x [OH - ] = 1 x e. [H + ] ÷ [OH - ] = 1 x

Daily Quiz Questions 1. What is true of [H + ] and [OH - ]? a. [H + ] = [OH - ] b. [H + ] x [OH - ] = 1 x c. [H + ] ÷ [OH - ] = 1 x d. [H + ] x [OH - ] = 1 x e. [H + ] ÷ [OH - ] = 1 x

Daily Quiz Questions 2. In a neutral solution, pH = a. 0 b. 0.5 c. 1 d. 7 e. 14

Daily Quiz Questions 2. In a neutral solution, pH = a. 0 b. 0.5 c. 1 d. 7 e. 14

Daily Quiz Questions 3. 1 x = ? a. 5 b. 100,000 c ,01 d ,001

Daily Quiz Questions 3. 1 x = ? a. 5 b. 100,000 c ,01 d ,001

Daily Quiz Questions 4. Which number is bigger? a. 1 x b. 1 x 10 -6

Daily Quiz Questions 4. Which number is bigger? a. 1 x b. 1 x 10 -6

Logarithms

The logarithm of a number is the number of times 10 must be multiplied by itself to equal that number.

Logarithms 1000 = 10 x 10 x 10 log 1000 = 3

Logarithms To find the logarithm of a number, count the zeroes or, if the number is in scientific notation, look at the exponent.

Logarithms 1 = 1 x = 1 x = 1 x = 1 x = 1 x log 1 = 0 log 10 = 1 log 100 = 2 log 0.1 = -1 log 0.01 = -2

Logarithms

You can multiply two numbers by adding their logarithms.

Logarithms You can multiply two numbers by adding their logarithms. 100 x 1000 = 100,000

Logarithms You can multiply two numbers by adding their logarithms. 100 x 1000 = 100, = 5

Logarithms You can multiply two numbers by adding their logarithms. 1 x 10 8 = 100,000,000

Logarithms You can multiply two numbers by adding their logarithms. 1 x 10 8 = 100,000, = 8

Logarithms You can multiply two numbers by adding their logarithms. 2 x 10 8 = 200,000,000 ? + 8 = ?

Logarithms So what’s the logarithm of 2? You have to look it up. 2 x 10 8 = 200,000,000 ? + 8 = ?

Logarithms So what’s the logarithm of 2? You have to look it up. 2 x 10 8 = 200,000, = 8.301

Logarithms What if the number is small instead of big?

Logarithms What if the number is small instead of big? = 3 x 10 -4

Logarithms What if the number is small instead of big? = 3 x log = log 3 + log 10 -4

Logarithms What if the number is small instead of big? = 3 x log = log 3 + log = – 4

Logarithms What if the number is small instead of big? = 3 x log = log 3 + log = – 4 =

Logarithms You can find the logarithm of any number by pressing the “log” key on a calculator…

Logarithms You can find the logarithm of any number by pressing the “log” key on a calculator… but

Logarithms You can find the logarithm of any number by pressing the “log” key on a calculator… but …if you don’t understand what the calculator is doing, the information is useless to you.

Logarithms Try a few!

Logarithms log 10 3 =

Logarithms log 10 3 = 3

Logarithms log 10 8 =

Logarithms log 10 8 = 8

Logarithms log =

Logarithms log = -10

Logarithms log 2 =

Logarithms log 2 = 0.301

Logarithms log 5.8 =

Logarithms log 5.8 = 0.763

Logarithms log 9.2 =

Logarithms log 9.2 = 0.963

Logarithms log 4 x =

Logarithms log 4 x =

Logarithms log 4 x =

Logarithms log 8.3 x 10 5 =

Logarithms log 8.3 x 10 5 =

Logarithms log 8.3 x 10 5 = 5.919

Logarithms log 7.1 x =

Logarithms log 7.1 x =

Logarithms log 7.1 x =

Logarithms log 4.8 x =

Logarithms log 4.8 x =

Logarithms log 4.8 x =

pH pH = -log [H + ] pOH = -log [OH - ] pH + pOH = 14

[H + ] = What is the pH? What is the pOH? Is it acidic or basic?

[H + ] =

= 3.5 x 10 -3

[H + ] = = 3.5 x log = log log 10 -3

[H + ] = = 3.5 x log = log log = – 3

[H + ] = = 3.5 x log = log log = – 3 = –2.456

[H + ] = = 3.5 x log = log log = – 3 = –2.456 pH = 2.456

[H + ] = pH = pOH = 14 – = The solution is acidic.

Homework Page 611 # 19 Page 612 # 20