His students also tested the acidity or basicness of various liquids, such as a baking soda compound and vinegary, by adding them to a red cabbage extract and watching the resulting change in color.

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Baking soda (sodium bicarbonate) is a natural substance with a variety of uses. It has an alkalizing effect, which means it reduces acidity.

How did a ‘health drink’ from the early 1800s spawn so many names and variations? An expert in American dialects explains.

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