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About This Instructable

License:9,733 views

364 favorites

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(/member/Ludvic/)

Ludvic

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Hi, My name is Luigi "Ludvic" for thefriends, I really like the recycle, thetechnology and the Chemistry, another of 

my hobby is Videomaking and I loveYoutube, You can check my project onLudvicTV...read more » (/member/Ludvic/)

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More by Ludvic

Ph indicator (/tag/type-id/category- living/keyw ord-

ph+indicator/)

base (/tag/type-id/category-living/keyw ord-base/)

alcaline (/tag/type-id/category-living/keyw ord-

alcaline/)

acid (/tag/type-id/category-living/keyw ord-acid/)

red cabbage indicator (/tag/type-id/category-

living/keyw ord-red+cabbage+indicator/)

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Grab a chopping board and cut the Cabbage in tiny piece, this help the juice to get

out in the next step, after, put all product in a pan

Step 2: Start to boil

Related

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(http://cdn.instructables.com/F2G/TS1S/I7ELFBTL/F2GTS1SI7ELFBTL.LARGE.jpg)

(http://cdn.instructables .com/FJZ/GGM5/I7ELFCPO/FJZGGM5I7ELFCPO.LARGE.jpg)

(http://cdn.instructables.com/FXH/DK96/I7ELFBXC/FXHDK96I7ELFBXC.LARGE.jpg)

how to make indicator (/tag/type-id/category-

living/keyw ord-how +to+make+indicator/)

Red Cabbage pH Indicator 

(http://www.instructables.c

Cabbage-pH-Indicator/?utm_source=base&utm_m

Kitchen laboratory II: The

CO2 trap

(http://www.instructables.c

laboratory-II%3a-The-CO2-

real green e ggs (and

ham)

(http://www.instructables.c

green-eggs-and-ham/?

Testing the Water 

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the-Water/?

utm_source=base&utm_m

The Color-Changing

Sports Drink

(http://www.instructables.c

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You only add 1 liter of tap water with your red cabbage and place the pan on thesource of heat.

When the water start to boil you can see the water becames dark purple, now you

can stop the heat and remove the pan from the fire.

Step 3: Filter 

(http://cdn.instructables.com/FTA/14JZ/I7ELFCZU/FTA14JZI7ELFCZU.LARGE.jpg)

(http://cdn.instructables.com/F8I/GKSS/I7ELFDX8/F8IGKSSI7ELFDX8.LARGE.jpg)

(http://cdn.instructables.com/FQA/HN4O/I7ELFDJ9/FQAHN4OI7ELFDJ9.LARGE.jpg)

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Remove all solid part from the liquid and after filter with a strainer.

You can see a very dark purple, but for regular use you need to dilute with the

water, this is the neutral indicator. There is different type of cabbage and the color 

can change of dark or light , for my perfect indicator I have diluted with 1/3 part of 

concentrate indicator and 2/3 part of tap water and obtained light purple color 

Step 4: Test It!

Ok now the best part of tutorial! the test.

For make this you only need different type of product:

Vinegar PH acid

Lemon juice PH acid

Baking Soda PH alcaline

(http://cdn.instructables.com/FO7/H6L5/I7ELFWHQ/FO7H6L5I7ELFWHQ.LARGE.jpg)

How to Make pH Indicator  by Ludvic (/member/Ludvic/)

 

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We have a be nice comm ent policy.

Please be positive and constructive.  I Made it! Add Images Make Comment

(/member/TimothyV/)

yesterday Reply

(/member/Ludvic/)

yesterday Reply

 Ammonia PH alcaline

You only test your product with add few drops of the liquid you want to test in the

indicator, and you see the color of the indicator change, red if acid and green or 

blue if alcaline!

Thank You for your attention and follow me here on instructables :D

Ludvic

TimothyV (/member/TimothyV/)

pH

Ludvic (/member/Ludvic/) (author) TimothyV

Thank You so Much man to correct me! :D

tosacj (/member/tosacj/)

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(/member/tosacj/)

yesterday Reply

(/member/electronixTech/)

8 days ago Reply

(/member/Etripp/)

5 days ago Reply

(/member/Bverysharp/)

10 days ago Reply

(/member/Suzanne+in+Orting/)

11 days ago Reply

Very nicely done. I used to teach chemistry and it brings back memories.

electronixTech (/member/electronixTech/)

Great instructable. I would use distilled water rather than tap water in case there

are minerals in the tap water that would affect the solution.

Etripp (/member/Etripp/)  electronixTech

Just a small semantic point. Here in the UK (the home of science!) it is

 ALKALINE

not alcaline. Something to do with potassium (K)

Bverysharp (/member/Bverysharp/)

Great! Just what I have been looking for. The grandson is very interested in

Chemistry & colour change, so this is ideal. Thanks!!!

Suzanne in Orting (/member/Suzanne+in+Orting/)

I'm thinking: soak a freshly washed, white t-shirt in the cabbage juice. Spray,

sprinkle, splash the other liquids on it as a totally kid-safe tie dye. I just wonder 

what to use as a mordant.

Or perhaps, put them all in spray bottles to use on paper. Then the mordant

wouldn't be needed.

I wonder if you could use cabbage juice in hand made paper, perhaps by boiling

it down first. Then your lemon juice etc would be like e reverse invisible ink.

Oh the ideas.....

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(/member/nwlaurie/)

10 days ago Reply

(/member/Suzanne+in+Orting/)

10 days ago Reply

(/member/Romninja/)

10 days ago Reply

(/member/Suzanne+in+Orting/)

10 days ago Reply

(/member/maxhuey/)

10 days ago Reply

(/member/nwlaurie/)

10 days ago Reply

nwlaurie (/member/nwlaurie/)  Suzanne in Orting

I LOVE these ideas!! Are you going to try them out? Or do I have to...

Suzanne in Orting (/member/Suzanne+in+Orting/)  nwlaurie

Gotta wait for it to stop raining.

Romninja (/membe r/Romninja/)  Suzanne in Orting

Iif you wash it you would expose it to a base, so everything would go a

single color,i think.

Suzanne in Orting (/member/Suzanne+in+Orting/)  Romninja

Detergent would be basic, but I think that most newshirts would have various fabric treatments that

would need to be washed out. Perhaps just good,

fresh soft water would work.

maxhuey (/member /maxhuey/)

Lemon is acidic??

nwlaurie (/member/nwlaurie/)  maxhuey

Certainly is: ever heard of citric acid? Comes from citrus fruits.

ptkrf (/member/ptkrf/)

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10 days ago Reply

(/member/russ_hensel/)

16 days ago Reply

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11 days ago Reply

(/member/Ludvic/)

16 days ago Reply

(/member/jmacdonald13/)

11 days ago Reply

Last image suggests that cabbage changes colour for each pH value... So far as

I know it only goes from 1 to 12. Also since it has organic matter in it, is it really

OK to use for measuring strong acids and bases?

 Aside from that it's great. reminds me of my childhood...

russ_hensel (/member/russ_hensel/)

Very very nice. As a kid I discovered that some flower do similar things. I think I

used something in the rhododendron family. Now my chicory weeds seem to do

something like the same thing, and hydrangeas are well know by gardeners to

change color depending on the ph of the soil. Investigating this would be a good

science project.

Suzanne in Orting (/member/Suzanne+in+Orting/)  russ_hensel

Hydrangeas will bloom in diffeerent colorsdepending on the soil ph.

Ludvic (/member/Ludvic/) (author) russ_hensel

Sure! there are many plants that have various characteristics similar to

red cabbage, : D

 jmacdonald13 ( /membe r/jmacdonald13/)

Great idea, I've often seen the colour change from pickled cabbage when you

dilute it with tap water, our tap water is very hard, never thought of extracting the

 juice from fresh cabbage. Great project for little and big kids. :-)

DaddysGal22 (/member/DaddysGal22/)

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(/member/DaddysGal22/)

12 days ago Reply

(/member/threeoutside/)

12 days ago Reply

(/member/susiefreckleface/)

14 days ago Reply

(/member/mmaatkamp/)

16 days ago Reply

I'm in sixth grade so I'm learning pH levels and all that stuff. Fun!

threeoutside (/member/threeoutside/)

Very nice! This would be a great, simple science experiment for my 6-year-old

granddaughter!

susiefreckleface (/member/susiefreckleface/)

very cool ible. thanks.

mmaatkamp (/member/mmaatkamp/)

This is so awesome! I never knew! Gotta buy me some cabbage soon :)

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