PH scale.

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Presentation transcript:

pH scale

Water In pure water the [H+] and [OH-] must be the same because 1 ion of each is formed when it breaks apart Kw = water equilibrium constant Kw = 1 x 10-14 = [H+] x [OH-]

Kw problems IF the [OH-] = 0.01 M what is the [H+]? If the [H+] = 0.000001 M what is the [OH-]?

pH pH = pouvoir hydrogene (French) = power of H pH scale is from 0-14 Acids: 0-6.9 Neutral 7 Base 7.1-14 pH = -log of [H+]

pH problems What is the pH of a solution with a [H+] = .000001 M? Is this an acid or base?

What if you know the pH? [H+] = 10-pH If the pH is 4 what is the [H+]? What is the [OH-]?

pH vs pOH pH + pOH = 14 What is the pH if the pOH is 11? What is the pOH if the pH is 6?

Challenge problem If the [H+] is 0.000000001M what is the [OH-]? pH? pOH? Is this an acid or base?