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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: RydbergConstant on March 06, 2008, 10:16:20 PM

Title: [H+] problem please help
Post by: RydbergConstant on March 06, 2008, 10:16:20 PM
a solution in which [OH-] is 140 times greater than [H+]:

What is [H+]?
Title: Re: [H+] problem please help
Post by: Arkcon on March 06, 2008, 10:20:46 PM
Quote from: RydbergConstant on March 06, 2008, 10:16:20 PM
a solution in which [OH-] is 140 times greater than [H+]:

What is [H+]?

The definition of pH and pOH is, what?  pH = ... ?
Title: Re: [H+] problem please help
Post by: RydbergConstant on March 06, 2008, 10:25:46 PM
the question asks what is the concentration of hydronium ions which is pH remember [OH-] is pOH and [H+] is pH
Title: Re: [H+] problem please help
Post by: Padfoot on March 07, 2008, 12:56:19 AM
Remember that
pH+pOH=14
or
[H+][OH-]=10-14
http://en.wikipedia.org/wiki/Self-ionization_of_water

Can you do the algebra to solve?
Title: Re: [H+] problem please help
Post by: AWK on March 07, 2008, 01:01:59 AM
The problem has nothing with pH and pOH directly. This is a simple equation:
[H3O+] x 140 x [H3O+] = 10-14