![]() ![]() Most of the food that we consume is generally acidic, with some exceptions, like egg whites. Each number represents a 10-fold change in alkalinity or acidity for instance, when comparing the acidity of lemon juice (pH = 2) to vinegar (pH = 3), lemon juice is ten times more acidic than vinegar, even though their pH values are only 1 pH apart. Substances with a pH of 7 are said to be neutral – which means they are neither acidic nor basic. Substances with a pH of 0 are said to be very acidic, while substances with a pH of 14 are said to be very basic. Using a scale of 0 – 14, acids and bases are on opposite ends (see picture above). The strengths of acids and bases are measured by using a pH scale, a measure of how acidic or basic a substance is. the soil or atmosphere), and can be used to determine the amount of acid or base present. This means that those fruits and vegetables will also change colour according to the acidity of their environment (i.e. An indicator changes colour when it comes into contact with an acid or a base. There are many different types of indicators we can use and the colour produced depends on the type of indicator used. So, even though you wrote messages in liquids that are white or colourless, these changes in the red cabbage indicator enable you to see the messages.Ĭabbage juice, grape juice, and many other plant juices are acid/base indicators. The more basic, the brighter the green it turns. The more acidic the sample, the brighter the pink colour it is. When mixed with an acid, the juice turns pink-red but when mixed with a base, the juice turns blue-green (see image above). Red cabbage juice looks dark red, or purple, until it comes into contact with an acid or a base. After the papers are dry, dip another paintbrush into the cabbage juice and brush over the secret messages. ![]()
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