Question

method to prepare red cabbage indicator?

Answer 1

Chop the cabbage into small pieces until you have about 2 cups of chopped cabbage. Place the cabbage in a large beaker or other glass container and add boiling water to cover the cabbage. Allow at least ten minutes for the color to leach out of the cabbage. (Alternatively, you can place about 2 cups of cabbage in a blender, cover it with boiling water, and blend it.)Filter out the plant material to obtain a red-purple-bluish colored liquid. This liquid is at about pH 7. (The exact color you get depends on the pH of the water.)Pour about 50 - 100 mL of your red cabbage indicator into each 250 mL beaker.Add various household solutions to your indicator until a color change is obtained. Use separate containers for each household solution - you don't want to mix chemicals that don't go well together!

Answer 2

Materials You Will NeedRed cabbageBlender or knifeBoiling waterFilter paper (coffee filters work well)One large glass beaker or another glass containerSix 250 mL beakers or other small glass containersHousehold ammonia (NH3)Baking soda (sodium bicarbonate, NaHCO3)Washing soda (sodium carbonate, Na2CO3)Lemon juice (citric acid, C6H8O7)Vinegar (acetic acid, CH3COOH)Cream of tartar (Potassium bitartrate, KHC4H4O6)Antacids (calcium carbonate, calcium hydroxide, magnesium hydroxide)Seltzer water (carbonic acid, H2CO3)Muriatic acid or masonry's cleaner (hydrochloric acid, HCl)Lye (potassium hydroxide, KOH or sodium hydroxide, NaOH)ProcedureChop the cabbage into small pieces until you have about 2 cups of chopped cabbage. Place the cabbage in a large beaker or other glass container and add boiling water to cover the cabbage. Allow at least ten minutes for the color to leach out of the cabbage. (Alternatively, you can place about 2 cups of cabbage in a blender, cover it with boiling water, and blend it.)
Filter out the plant material to obtain a red-purple-bluish colored liquid. This liquid is at about pH 7. (The exact color you get depends on the pH of the water.)Pour about 50 - 100 mL of your red cabbage indicator into each 250 mL beaker.Add various household solutions to your indicator until a color change is obtained. Use separate containers for each household solution - you don't want to mix chemicals that don't go well together!