Saturday, May 28, 2011

Preschool Science: Acid/Base Experiment

Why do we seem to do so many "bloggable" activities when I'm taking a blogging break?

LOTS of science fun this week.

We started by following MaryAnne at Mama Smiles lead by playing with vinegar and baking soda.

Then we moved on to an experiment to see which kitchen ingredients (salt, sugar, parsley, coffee, etc.) would dissolve in water. It was mostly to reinforce the idea of developing a hypothesis and conducting an experiment to prove or disprove it.

At the suggestion of a friend (and chemistry teacher), we soaked some red cabbage in boiling water for 10 minutes, then used that (purple) water as an acid base indicator.  We poured the cabbage water into our liquids and observed the results.

The bases turned bluish, the acids turned reddish.

We experimented a little with trying to neutralize our acids by adding tums or baking soda. And of course did some more fizzy baking soda / vinegar fun.

When we were done, I soaked a coffee filter for a few hours in the leftover cabbage juice, then set it out to dry. The next day, we cut it up and used it as homemade litmus paper. It worked great! We tested many of the same ingredients from the day before, plus daddy offered up some stronger chemicals from his dark room.

Science is fun!

I'm linking this post up with Science Sunday.

- Posted using BlogPress from my iPhone


Raising a Happy Child said...

I've been missing you! We have this Kitchen Science book home from the library that has cabbage experiment too. Have to do it once I get some cabbage.

Pam (@iwriteinbooks) said...

What a great post! We love this sort of thing. I do a lot of preschool science with the kids at school and it's incredible how adept they are at figuring out hypothesis and solutions and new questions. Great stuff thanks for sharing!

Ticia said...

I've been meaning to do that with cabbage. There's so many great things you can do with that......

MaryAnne said...

We need to try that cabbage experiment!

How did your litmus paper turn out?

MarĂ­a Corcuera said...

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