Saturday, September 4, 2010

Make a pH indicator with red cabbage

Testing for acids and bases usually requires universal indicator or litmus which isn’t exactly a common home material.  This experiment will show you how to make an indicator with nothing but red cabbage and tap water.

Chop up red cabbage into small chunks and place them into a pot of boiling water.  Soluble flavin will dissolve into the water giving it a deep purple/red colour.  Allow to cool and pour off this solution.

 DONE! Easy wasn’t it?

You can test it on a variety of house cold chemicals to see their acidity.  Strong acids will be red, weak acids purplish red, neutral is purple, weak alkaline is blue and strong alkaline is green.



Suggestions on acidic and alkaline chemicals to test:
  • Lemon juice
  • Oven cleaner
  • Washing soda
  • White vinegar
  • Antacid tablets
  • Carbonated water

39 comments:

  1. kinda neato!

    9/4 love baby! clicked for love!

    http://musclemaniamadness.blogspot.com

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  2. Is there money to be had with a degree in chemistry?

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  3. Nice I always liked using the PH strips back in school.

    Now what would I like to find out hmmm

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  4. neat! hahah

    anyway, just doin' the daily rounds.

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  5. I am a bit of geeky science girl so I have to try this! :P

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  6. I had no idea you could do this...

    Showing some 9/4 love

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  7. Showing teh daily support

    http://the-state-of-human-intelligence.blogspot.com/

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  8. Say, where can I get some Ferric Chloride cheap? I figure you might know. :3

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  9. Every post on this blog so far has been great! Keep posting and I'll keep coming back.

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  10. @Johnn: Try ebay, that's where I get most of my stuff

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  11. Awesomeness, I remember doing that in O-Chem lab :)

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  12. In all honestly I love Lemon Juice..


    Showing some daily support, keep up the awesome posts!

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  13. i'm in your site, givin you a favor! pls return it! :3

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  14. Supportin!

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    http://the-state-of-human-intelligence.blogspot.com/

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  15. well this looks useful for the home chemist, but if you're doing lab work I'd assume you'd need more info say the 1-14 scale.

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  16. lol that's complicated
    saci-cu-bani.blogspot.com

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  17. good stuff

    will be back to this blog

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  18. Showing some daily support for my followers!

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  19. Showing some support :)

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  20. You have some really interesting posts!
    Gonna keep following you from now on :)

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  21. rad!

    9/5 love and clicking. Return the favors!

    http://musclemaniamadness.blogspot.com

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  22. i'm in your site givin you a favour! pls return it! :3

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  23. Did this in school a long time go :D

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  24. Does it really work? Must be hard to see the color.

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  25. Can you make a guide on how to lower my pH? It's too high.

    Showing some support, great post, keep em coming.

    You should VIEW my blog, ;)

    http://adpluscommunications.blogspot.com/

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  26. I am trying this tonight, or tomorrow. I had no idea it worked like that. Rock on cabbage.

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  27. Nice tip!

    http://x-kelu-x.blogspot.com/

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  28. Great stuff,can't wait for more tips. What other stuff can I find in my cabinets.

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  29. very interesting! need moar posts from you...

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  30. They taught us about this in school :)
    Showin daily love

    http://nyaoaooa.blogspot.com

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  31. fantastic
    http://hippilazmikfil.blogspot.com/

    ReplyDelete