Testing Toothpaste for Alkalinity

Testing Toothpaste for Alkalinity

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Credit: Turtle Rock Scientific/SCIENCE PHOTO LIBRARY

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Caption: Testing toothpaste for alkalinity. Universal indicator changes its colour depending on the pH. Here a universal indicator paper strip has changed colour from yellow to blue-green after coming in contact with toothpaste that contains sodium bicarbonate (NaHCO3). The test shows that the toothpaste is slightly alkaline.

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Keywords: alkali, alkaline, baking soda, base, basic, chemical, chemistry, indicator, nahco3, paper, ph, ph indicator, sodium bicarbonate, strip, test, toothpaste, universal indicator

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