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| http://www.phscale.net/ |
pH scales are a measurement of acidity or base in a liquid. Litmus paper is usually used to test pH levels because it turns into the colors above depending on how acidic it is. Acids are usually in sour things like lemons as shown above. Bases are usually in cleaning liquids like ammonia and bleach (don't mix those together!).
This week the S&EP, I would say was that we conducted an investigation. We did this by mixing liquids of acids or bases together with indicators to show how acidic something is.
This XCC is cause and affect. I think that it is cause and affect because it was, if you mix the liquid that we are tesing with the indicator liquid then it changes color and shows how acidic the liquid is.
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