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%w/v to pH

  1. Apr 7, 2015 #1
    Hi. I would like to ask help on what is the equivalent of % w/v to pH?
    Say for example: What is the pH of 4% w/v?
     
  2. jcsd
  3. Apr 7, 2015 #2

    SteamKing

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    Your question is a little vague. o_O

    In any even, pH is based on the activity of hydrogen ions in an aqueous solution:

    http://en.wikipedia.org/wiki/PH

    As can be seen from this article, different materials in solution have different pH values. The pH of pure water is defined as 7. A pH value less than 7 indicates an acid, while a pH value greater than 7 indicates a base.
     
  4. Apr 7, 2015 #3
    %w/v is the acetic acid concentration in an acidic solution, vinegar, and that is the "unit" used when you are titrating the solution. Now I want to use a pH meter but I don not know what is the equivalent in pH of 4% w/v or even how to derive it. I need an "accepted" pH of vinegar to see if my vinegar conforms to the set standards.
     
  5. Apr 7, 2015 #4

    SteamKing

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    According to this article:

    http://en.wikipedia.org/wiki/Acetic_acid

    a 1.0 M solution of acetic acid (about the strength of household vinegar) has a pH of about 2.4. I have no idea if a 1.0 M solution is equivalent to 4% w/v for the acetic acid in vinegar. :sorry:
     
  6. Apr 7, 2015 #5
    thanks. :smile:
    I'm thinking that if there is a way to convert %w/v to mole, the pH can be calculated but I don't know how and I did several researches but got no answer...
     
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