How to Measure the Acidity of Fruits

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The pH scale is in the range from 0 to 14 and determines how basic or acidic a solution is. The neutral media has pH 7. Values below 7 correspond to acidic solutions. The majority of fruits contains various organic acids and hence the fruit pH falls into the acidic range between 2 and 6. Acidity of fruits can be determined relatively easy using pH paper. Avoiding high-acid fruit and food may especially help people with digestive or dental problems.

Things You'll Need

  • pH paper
  • Kitchen knife
  • Plate
  • Paper towel
  • Wash fruits with water and then dry them using paper towels.

  • Cut a piece of fruit in half using the knife. Put both halves on the plate.

  • Cut a 1-1/2-inch piece of the pH paper.

  • Take one fruit half and firmly press the piece of the pH paper against the cut side of the fruit.

  • Compare the color of the paper strip with the standard pH scale printed on the pH paper pack to determine the acidity of this fruit.

  • Repeat Steps 2 to 5 for the other fruits.

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