Some other common substances should only be tested with close adult supervision, and preferrably with gloves worn. These often have an orange colouring added. Vitamin C tablet (ascorbic acid, food additive E300). Vinegar (acetic acid, also called ethanoic acid). Testing a colour free soft drink means the colour produced is just the indicator. This often has its own blue tint, but window cleaners containing ammonia are not as popular these days and so can be hard to find. From comparing the colours that known acids turn the red cabbage juice, you should be able to figure out which of the others are acids and which ones are bases.Īmmonia-based window cleaner. These substances are commonly found in kitchens, or can be bought at most supermarkets. The juice can simply be washed down the drain when you've finished with it.īy the time this photo was taken. If the jug has a lid it'll help keep the smell in until you use it. Tip it into a jug using the saucepan lid to hold back the pieces of cabbage. The resulting juice is a strong violet colour. Red cabbage juice is prepared by chopping red cabbage leaves (the pieces don't have to be very small), putting them in a saucepan with water, and boiling for a short time. No special equipment is needed and the many colour changes make it popular with children of all ages. Making red cabbage juice is an easy and inexpensive way to test acids and bases at home. Take the colour just a few seconds after adding the red cabbage juice, not several minutes later. Note that the green colour slowly loses its vividness, and green slowly fades through greenish yellow into yellow. The swatches in this table show the approximate colours the juice turns in solutions of differing pH. (Leaving it as red cabbage until needed is less smelly.) It useful for testing, but unfortunately it doesn't have a long life and Red cabbage leaves containĪ chemical called anthocyanin, which changes colour with pH. Range of colours depending on the pH of the solution it is added to. Red cabbage juice is called a universal indicator because it shows a Red Cabbage Juice – universal pH indicatorĪcids and Bases pages: Acids and Bases | Indicators | Red Cabbage Juice Home Tutoring - Chemistry - Acids and BasesĮxperiments Periodic Table Acids and Bases Reference Safety
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