Put the red cabbage leaves into the blender with 800mL of water. Close the top and let it blend at high power for 30 seconds. The cabbage contains a natural pH indicator that changes colors according to the acidity of the solution. Liquid: Color Predicted pH Actual pH Water Lemon Juice Baking Soda Shampoo 2. indicator to the same test tube. Are the colors the same? Red Cabbage as a pH Indicator Making the pH Indicator What You Need: • A red cabbage • A pot of water Procedure: 1. Next, use the water bottle to add about 1 mL (about 15 drops) of deionized water into another clean small test tube, then add 5-10 drops of cabbage indicator. Pour 1Tbsp of cabbage juice into each of the cups, swirling gently. You can try seeing how tap water affects pH by creating one batch of anthocyanin indicator using distilled water, and another batch with tap water. My hypothesis was correct in assuming that it would change colors with different substances or mixtures. Since the anthocyanin indicator needs to have a pH as close to neutral as possible, this is important. Record the color and pH under Buffer for the “Original (Before HCl added)” row. Leave to cool for about 30 minutes. The juice is prepared by soaking chopped red cabbage in boiling water for at least 10 minutes and then filtering the solution to eliminate any plant material. [Note: A solution in this sense simply means a substance dissolved in water. Write down what color each solution turns the cabbage juice, based on the following pH scale. Distilled water is more likely to have a neutral pH. 6. The pH of pure water is 7 and the normal range of surface water is between 6.5 and 8.5. In this case, the chemicals with indicator properties in the cabbage leaves are dissolved in boiling water.] For baking soda, add 1 tsp of baking soda into 2 tsps water. 5. It contains water-soluble anthocyanins, which have indicator properties and vivid colors, making it easy to visualize color changes that occur when they are exposed to different pH conditions. 2. Break apart the cabbage into small pieces and place into a pot 2. This investigation explores further applications of plant-derived dyes including reversible reactions based on oxidation/reduction chemistry and other reactions to illustrate colour changes that are The Cabbage Indicator Experiment My hypothesis for this experiment is if I put an acid or a base in to a neutral then it will change colors. 3. Cover the cabbage in water and boil for 20 minutes, allowing the color to leach out of the cabbage (see picture on right). Q8. Making the pH Indicator (this can be done in advance): 1. 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. Sieve the water and cabbage into a jug – you will notice that the cabbage liquid is very purple in colour. Flowers, fruits and vegetables contain a diverse range of anthocyanins. Pour the mixture through a strainer into a large container. Brassica oleracea, more commonly known as red cabbage, is useful as an acid-base indicator owing to the fairly wide range of pH related color changes. In this experiment, we will use the juice from red cabbage as a pH indicator to test common household liquids and determine their pH levels. (This should provide you with 600-800 ml of cabbage juice.) 3. The use of anthocyanins in red cabbage extracts as pH indicators has long been a popular classroom activity. Red cabbage juice is a good indicator of pH because it contains flavin, a pigment molecule that changes colors according to the concentration of hydrogen ions in a solution. 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