Wednesday, September 25, 2013

Red Cabbage pH Indicator Lab

This week we used red cabbage juice as a pH indicator.  First, we boiled a head of red cabbage in water.  We then let it cool and strained it.  We then placed the cabbage juice in a variety of liquids (vinegar, dissolved baking soda, ammonia, and tooth paste).  The mixture changed color based on the pH level of the liquid.  We matched the color to the following chart to find the pH.

Red Cabbage pH Indicator Color Chart

First, we broke apart our red cabbage.

Then, we cooked it for a while.

Finally, we strained it and used it as a pH indicator!

This experiment is simple to do at home with your family.  What is the pH of other liquids found in your house? 

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