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What is pH?. Concentration and hydrogen ions and hydroxide ions are a measure of The acidity and alkalinity of a solution. How was the concept of pH developed?. H 2 O is a molecule. Therefore, pure water does not conduct electricity. Or does it?.

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what is ph

What is pH?

Concentration and hydrogen ions and hydroxide ions are a measure of

The acidity and alkalinity of a solution.

how was the concept of ph developed
How was the concept of pH developed?

H2 O is a molecule.

Therefore, pure water does not conduct electricity.

or does it
Or does it?

When pure water was found to conduct very small currents of electricity, the self-ionization of water was discovered.

self ionization of water
Self-ionization of water

H2 O  H+ + OH-

Water can dissociate into Hydronium ions and hydroxide ions.

how much dissociation is there
How much dissociation is there?

[H+] = 1 x 10-7 M

[OH-] = 1 x 10-7 M

Therefore:

[H+] x [OH-] = 1 x 10-14 M

h x oh 1 x 10 14 m
[h+]x [OH-] = 1 x 10-14 M

Is called the

Ion-product constant

AKA: kw

ion product constant
Ion product constant

Kw = 1 x 10-14 M

acidity is a measure of the h of a solution
acidity is a measure of the [H+] of a solution.

If the [H+] of a solution is 1.0 x 10-5M, is the solution acidic, basic or neutral?

1.0x 10-5 M is greater than 1.0 x 10-7 M

Therefore the solution is acidic

practice acidic basic or neutral
Practice: acidic, basic or neutral?
  • [H+] = 6.0 x 10-10M
  • [H+] = 2.0 x 10-7 M
  • [OH-] = 1.0 x 10 -7 M
solve these problems using k w h x oh and determine whether solution is acidic neutral or basic
Solve these problems usingkw = [H+] x [OH-] and determine whether solution is acidic, neutral or basic
  • [OH-] = 1 x 10-3

2. [OH-] = 2.0 x 10-11

3. [OH-] = 3.5 x 10-7

the ph scale
The pH scale

Ranges from 0 -14.

0 – 6.9 = acidic

7.0 = neutral

7.1 – 14.0 = basic (alkaline)

so where do these numbers come from
So where do these numbers come from?

pH = - log [H+]

That’s where they come from!

what is the ph
What is the pH?
  • [H+] = 1.0 x 10-4 M
  • [H+ ] = 1.0 x 10 -2 M
  • [H+] = 1.0 x 10 -10 M
  • [H+] = 1.0 x 10-7 M
  • [H+] = 1.0 x 10-14 M
answers
answers
  • 4
  • 2
  • 10
  • 7
  • 14
get your calculators out and practice
Get your calculators out and practice.
  • [H+] = 0.0045 M
  • [H+] = 8.7 x 10-6 M
  • [H+] = 0.0015M
  • [H+] = 1.2 x 10-3 M
answers1
answers
  • PH = 2.35
  • PH = 5.06
  • PH = 2.82
  • PH = 2.92
find the ph and determine if it is acid basic or neutral
Find the pH and determine if it is acid basic or neutral
  • [H+] = 1.5 x 10-9
  • [H+] = 3.4 x 10-2
  • [H+] = 5.5 x 10-11
  • [H+] = 1.0 x 10-7
you can also calculate ph from oh
You can also calculate ph from [OH- ]

If you are given [OH-] use [H+] = 1 x 10-14

[OH-]

To find hydrogen ion concentration then solve for pH

pH = –log [H+]

let s practice
Let’s practice

Calculate the pH of a solution with a [OH-] of 3.5 x 10-9

exit slip your name here
Exit Slip: Your Name here……
  • Find the pH of a solution with an hydroxide concentration of [OH-] = 2.9 x 10-5

2. A solution has a hydrogen ion concentration of

[H+] = 5.0 x 10 -12. Is it acidic, basic or neutral?

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