Some indicators start out colorless and turn blue or pink, for example, when they mix with a base. [4], Red cabbage contains an anthocyanin-based dye that can be used as a pH indicator. When the dye is purple (at neutral pH, between an acid and a bee) there is a mixture of red and blue dye molecules, so making the dye purple. It is red, pink, or magenta in acids, (pH < 7), purple in neutral solutions (pH ≈7), and ranges from blue to green to yellow in alkaline solutions (pH > 7). The cabbage plants can be spaced about 30–65 cm (12–26 in) from one another. Adult Supervision Required. When the cabbage cooks and breaks apart, the resulting liquid is quite neutral in acidity. What compounds are responsible for the indicator properties of red cabbage? Science Box for Kids. Red Cabbage pH scale neutral Strong acid Strong alkali Equipment Beaker of water Mortar and pestle Filter / filter paper Bottle Red Cabbage Task 1 On a piece of A4 paper Write your name Draw a labelled, scientific drawing, of the apparatus needed to make red cabbage indicator Write a scientific method describing how to make red cabbage indicator. Indicators are chemical compounds that can be added to a solution to determine whether it is acidic or alkaline. Anthocyanin is also found in blueberries, grapes and lots of other plants. All acidic solutions, having pH less than 7 will turn the indicator into a shade of red color. Once the seedlings grow to about 5 centimetres (2 inches) tall, and have developed their first leaves, they can be hardened off and moved outside for transplanting. Extracting anthocyanins from household plants, especially red cabbage, to form a crude pH indicator is a popular introductory chemistry demonstration. A wide variety of plant materials containing anthocyanins will work as pH indicators. The scale is technical- ly open-ended but, since most substances have a pH somewhere between 0 and 14, that’s usually how you’ll see the pH scale depicted. pH 1-2 3-4 5-7 8 9-10 11-12 Acid/ Base Acid Acid Acid/Neutral Base Base Base Cutting the Cabbage: 1. Pour a small amount of red cabbage indicator into a glass. Red cabbage juice contains chemicals called anthocyanins. All acidic solutions, having pH less than 7 will turn the indicator into a shade of red color. [1] In acidic soils, the leaves grow more reddish, in neutral soils they will grow more purple, while an alkaline soil will produce rather greenish-yellow coloured cabbages. Over 12+ Cool Science Topics – Rockets , Chemistry, Electronics, Polymers , Engineering, Magnets, Forensic, Colors and dyes, Kitchen science +more. Be careful when grating the red cabbage; Procedure of experiment. Materials: ¼ of a cabbage Supplies: 1. [5], Red cabbage has a high content of vitamin C and vitamin K, containing 44% and 72%, respectively, of the Daily Value (DV) per 100-gram amount (right table of USDA nutrient values). Cut ¼ of a cabbage into thin strips like shown below: 2. Such compounds include sulforaphane and other glucosinolates which may stimulate the production of detoxifying enzymes during metabolism. Neutral solutions result in a purplish color. Making the pH Indicator (this can be done in advance): 1. Red cabbage pH indicator solution. As is the case here, flavonoids are usually very pigmented. Red Cabbage pH scale neutral Strong acid Strong alkali Equipment Beaker of water Mortar and pestle Filter / filter paper Bottle Red Cabbage Task 1 On a piece of A4 paper Write your name Draw a labelled, scientific drawing, of the apparatus needed to make red cabbage indicator Write a scientific method describing how to make red cabbage indicator. 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