Preparing the Cabbage-Juice Indicator
Chop one head of red cabbage leaves into about 1-inch pieces and place them in a blender. Fill the blender about half full of water and blend the mixture at high speed for about 30 seconds.
Place a coffee filter inside a strainer and pour the cabbage juice through the coffee filter into a quart-sized jar.
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Cap the jar and label it "Cabbage Juice Indicator."
Place a sample for pH measurement in a small jar, such as a baby-food jar and fill it about half full with the sample.
Add approximately 1.5 ounces of the cabbage-juice indicator solution to the sample and stir it briefly with a spoon.
Estimate the pH by observing the color of the sample and cabbage-juice mixture. A light or dark pink solution indicates an acidic solution with pH between 2 and 4, purple or blue indicates a neutral solution of pH 6 to 8, green indicates a basic pH of 10 to 12 and yellow indicates a pH above 13. See the Resources section for a detailed color-to-pH correlation chart.
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Read more: How to Determine pH Using Cabbage Juice | eHow.com http://www.ehow.com/how_8252473_determine-ph-using-cabbage-juice.html#ixzz29b8sKBKp