Chapter 18 Lecture 2

Chapter 18 Lecture 2 - Autoionization of Water and the pH...

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

View Full Document Right Arrow Icon
Autoionization of Water and the pH Scale Water is an extremely weak electrolyte + H O( l ) H 2 O( l ) + 18-15 H 3 O + ( aq ) OH - ( aq )
Background image of page 1

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

View Full DocumentRight Arrow Icon
( +H ( H + q +OH - q [H 3 O + ][OH - ] H 2 O( l ) + H 2 O( l ) 3 O ( aq ) + OH ( aq ) K c = [H 2 O] 2 ] OH The Ion-Product Constant for Water 0 10 4 t 25 K c [H 2 O] 2 = [H 3 O + ][OH - ] K w = A change in [H 3 O + ] causes an inverse change in [OH - ]. = 1.0 x 10 -14 at 25 o C In an acidic solution, [H 3 O + ] > [OH - ] In a neutral solution, [H 3 O + ] = [OH - ] 18-16 In a basic solution, [H 3 O + ] < [OH - ]
Background image of page 2
The relationship between [H 3 O + ] and [OH - ] and the relative cidity of solutions acidity of solutions. + H - ivide to [H 3 O ] [OH ] Divide into K w [H 3 O + ] > [OH - ] [H 3 O + ] = [OH - ] [H 3 O + ] < [OH - ] ACIDIC SOLUTION BASIC SOLUTION NEUTRAL SOLUTION 18-17 http:// www.youtube.com/watch?v=zP9qEiaL4kQ&feature=player_embedded Cr 2 O 7 2- ( aq ) + H 2 O( l ) 2 CrO 4 - ( aq ) + 2H + ( aq )
Background image of page 3

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

View Full DocumentRight Arrow Icon
Calculating [H 3 O + ] and [OH - ] in an Aqueous Solution PROBLEM: A research chemist adds a measured amount of HCl gas to pure water at 25 o C and obtains a solution with [H 3 O + ] = 3.0x10 -4 M . alculate [OH - Is the solution neutral acidic or basic? Calculate [OH ]. Is the solution neutral, acidic, or basic?
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 07/31/2010 for the course CHEM CHEM 01C taught by Professor Unknown during the Spring '10 term at UC Riverside.

Page1 / 12

Chapter 18 Lecture 2 - Autoionization of Water and the pH...

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