Making a PH reactive liquid is an easy science fair project that could be made in a single evening with great results. This project requires little more than red cabbage and some basic household supplies. This project is an easy way to visually determine if a liquid or powder is an acid or a base. With the plurality of liquids and powders in your household, this allows for vast experimentation.

Step 1: Materials

There are few required materials for this project.

The first and most important item is red cabbage. One large cabbage will yeild more PH liquid than is necessary, so it is probably best to cut it in half (or get a very small cabbage).

Also, a standard coffee filter is recommended.

<p>can you use the purple liquid to dye fabric or yarn? It is a very pretty color. </p>
<p>I don't know. It would be easy enough to try and see how it goes. I would speculate it would make a much lighter purple color than it currently is.</p>
<p>I am picking some up next grocery day. I have a ball of cotton yarn to try it on.</p>
<p>Thank you for this i am hoping to show my science teacher this!</p>
Can you use another thing instead red cabbage? I don't have red cabbages HELP ME!!!
<p>Very interesting, Thanks for sharing!</p>
<p>thanks! I may use this as my science project! LIFE SAVER!!!</p>
<p>Will have to try this sometime. Looks awesome!</p>
<p>Interesting. Good video!</p>
<p>You can also use purple all-the-way-through potatoes e.g. Purple Peruvians. It may help to dilute the solution with distilled water so it will change color more readily.</p>
<p><strong>love</strong> your <strong>vid</strong>/gif!!<strong> :^D</strong></p>
<p>I made this several years ago... definitely a fun activity. Appeals to the mind and the senses...</p>
<p>Eons ago I was a science teacher and this is neat idea demonstrating that chemistry is all around us. </p>
<p>Fun project, try adding the <a href="https://www.instructables.com/id/real-green-eggs-and-ham/" target="_blank">red cabbage juice to eggs to make them green</a>!</p>

About This Instructable




Bio: My name is Randy and I founded the Instructables Design Studio. I'm also the author of the books 'Simple Bots,' and '62 Projects to ... More »
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