Kw-pH - Todays lesson is brought to you by 7, 14, and the...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Today’s lesson is brought to you by Today’s lesson is brought to you by 7, 14, and the letters 7, 14, and the letters Kw, pH Kw, pH
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Kw: the ion-product constant of water Kw: the ion-product constant of water Q: will pure distilled water conduct electricity A: As the demo shows, it will (slightly). If water conducts electricity, ions must exist Water exists as an equilibrium, which is referred to as the self-ionization of water: H 2 O + H 2 O H 3 O + (aq) + OH (aq) Simplified reaction : H 2 O H + (aq) + OH (aq) Kc = [H 3 O + ] [OH ] [H 2 O] 2 Kw = or [H 3 O + ] [OH ] Note: H + is just shorthand for Kc = [H + ] [OH ] [H 2 O] Kw = or [H + ] [OH ]
Background image of page 2
Kw Kw What is the value of Kw? It has been measured at 1.0 x 10 –14 (25 °C) Notice (pg. 600) that by definition: when the solution is [H + ] > [OH ] acidic [H + ] < [OH ] basic [H + ] = [OH ] neutral Pure water is neutral since [H + ] and [OH ] must be identical (both come from one H 2 O) As temperature increases Kw increases Q: Rewrite the equilibrium of water with heat as a product or reactant (based on above point) Q: Do PE 1 (refer to example 15.1)
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Answers Answers As temperature increases Kw increases. It must be that: H
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/12/2011 for the course CHEM 1010 taught by Professor Marshall during the Spring '11 term at North Texas.

Page1 / 12

Kw-pH - Todays lesson is brought to you by 7, 14, and the...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online