![]() Kitchen tongs For safe removal of the cabbage leaves from the boiling water. Measuring cup For measuring out two cups of water. Medium-sized pan This should be big enough so that the cabbage leaves will lie on the bottom (although they do not have to lie completely flat). One or more coffee filters A package of these can also be purchased at most grocery stores. Two leaves of red (purple) cabbage A head of red cabbage can be purchased at most grocery stores. The number of indicator paper strips varies depending on the size they are cut. Amount: Makes approximately two cups of indicator solution. Cost: The total cost of a head of red cabbage and a pack of coffee filters is approximately $5-7. Total time (including testing): approximately 60-90 minutes. Finally, allow 15-20 minutes for testing the indicator solution and indicator paper with vinegar and baking soda (if desired). Time: Approximately 10-15 minutes to make the indicator (plus an additional 25-30 to allow it to cool), then about 15-30 minutes to make the indicator paper (the time needed depends on how the paper is dried). Vinegar (which is mildly acidic) and baking soda (which is mildly basic when dissolved in water) are used as examples in these instructions. Both the paper and the indicator solution itself can be tested with common household items (see steps 9-14). 3) This part is optional and is not necessary for actually making the indicator solution and paper. 2) Making indicator paper by soaking a coffee filter in the indicator solution and letting it dry, then cutting it into strips (see steps 6-8). About these instructions: Overview: These instructions can be divided into three parts: 1) Making a pH indicator by boiling cabbage leaves in water (see steps 1-5). Some optional steps at the end of the instructions (steps 9-14) explain how to use some household items to test the indicator solution and paper to see how they change color. ![]() The indicator paper works in the same way as the indicator solution itself: the paper changes color when it comes in contact with an acidic or basic substance. These instructions explain the simple process of how to make an indicator solution from the leaves of a red cabbage (also called purple cabbage) and how to make indicator paper by soaking a coffee filter in the indicator solution. When the indicator comes in contact with a substance, the indicator's color corresponds to that substance's approximate pH, which is a scale of zero to fourteen (with zero being the most acidic, seven being neutral, and fourteen being the most basic) that indicates the acidity or basicity of a substance. Introduction: A pH indicator measures whether a substance (usually a liquid) is acidic or basic, and some indicators can also measure how acidic or basic it is.
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