Both of these can be used as an acid-base indicator. The juice from red cabbage will turn different colours over a wide range of pH, from pH 2 (very acidic) to pH 13 (very basic). Red beet will be blue or red depending if it's in acid or base.
red cabbage is a good indicator
A buffer absorbs or releases excess hydrogen ions, making the solution hold at a steady pH. Since red cabbage indicator makes a good pH indicator, it has a neutral pH. any amount of acids or bases added would change the pH of the red cabbage juices. If it made a good buffer, it would not make a good pH indicator.
Some natural indicators include red cabbage, turmeric, and blueberries. These indicators change color in the presence of acids and bases due to their chemical properties. For example, red cabbage contains a pigment that changes from red in acids to green/blue in bases.
I've never heard of it changing color when it is cooled, but it does change color with pH, and can be used as an indicator for acids and bases.See the Web Links for more information about using cabbage color as a pH indicator.
Acids turn red/pink when red cabbage indicator is added. Alkali/bases turn blue/green. Neutrals turn purple.
Red cabbage is one of many varieties of cabbage grown in temperate regions worldwide. Its juice contains the pigment cyanidin, which is used as a homemade indicator of acids and alkalies because it turns the purple colored juice pink when an acid is added and blue when mixed with an alkali (or colorless in a strong alkali solution).
Acids turn universal indicator solution red.
If you blend red cabbage with water (the best ratio for this is 1:2, one cabbage leaf for two cups of water) and then add toothpaste the mixture will turn green. This indicates that toothpaste is a base. If you add vinegar instead the solution will turn red, indicating an acid.
Measurement of the strengths of acids.
i turns yellow and it turns pink when you add acids
it turns into a yellowish orangish. Depends on what acids.
No, an indicator's reaction in acids and bases is a physical change. Indicators change color based on the pH of the solution they are in, but the chemical composition of the indicator remains the same.