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Thread: pH

  1. #1 pH 
    Forum Sophomore biohazard87's Avatar
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    Can anyone tell me how to find pH without using any electronics?


    Noodles happen when you kiss a stranger in the alps.

    Mi padre tiene un impala.
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  3. #2  
    Forum Cosmic Wizard SkinWalker's Avatar
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    Visit your local Swimming Pool supply store, Aquarium Supply store, or any decent department store that has the above supplies, and you will probably find chemical pH test kits.

    You can also find test kits for water Hardness (carbonates), nitrates, etc.


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  4. #3  
    VM
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    There are a few simple ways to do that. However, if you really need to know the pH extremely accurately (a few hundredths of a unit) then you will need electronics. If accuracy is not that important then you have a few options.

    First, you can aquire several chemicals which are known as "indicators." Typically, indicators function by changing color at a certain pH. By using several indicators, you can narrow down the range of the pH of your solution. For instance, if you had 2 indicators, one that was blue at pH6 and above and clear below pH 6 and the other indicator was red below ph4 and clear above pH 4, then if you added both to your solution, and the solution was clear, you would know the pH was between ph4 and 6. This, i beleive is how most pool test kits work. They have several indicators that span a small range of pH's.

    If you don't feel like buying anything, then there is at least one pH indicator that you aquire for about $1. If you press red cabbage, the juice that comes out is a pH indicator (a chemical called flavin) this chemical's color varies somewhat smoothly depending on the pH of the solution it is in. In this way you know in general the pH of your solution baised on the color.

    Here is a link that has a small table showing the color-pH relationship;
    http://chemistry.about.com/library/weekly/aa012803a.htm
    (you can also just google "red cabbage pH indicator")

    NOw of course you may not wish to work with pressed cabbage everytime that you desire to know the pH. SO there is one last option: litmus paper. THis is a piece of paper that has been soaked with a pH indicator and then dried and cut into strips. Placing the strip into an environment will cause the color of the paper to change, refecting the pH of the solution. These things are pretty cheap and a LOT of fun. You can test the pH of tap water, household cleaners, urine, soda, ect. I thnk you will be surprised by what you find.

    Less chemistry on your part, with the litmus paper, however, it is more portable, acurate, and easy to use. Perhaps both are fun to try.

    Here is link to some pretty good litmus strips. There are several options on the page, each one covers a particular range of pH's -- or sometimes the whole range.

    http://vwrlabshop.com/product.asp_Q_pn_E_0011569

    anyway, i hope this helps. Have fun and keep us posted on the results!
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  5. #4  
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    I can help you find adittional info at the following link: http://support007.com/find.php?value=pH.

    Best regards
    Buba
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  6. #5  
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    Universal indicator or any other
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