How to Measure the Acidity of Fruits

Citrus fruits have different levels of acidity.
••• citrus fruits image by Maria Brzostowska from

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.

    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.

    Things You'll Need

    • pH paper
    • Kitchen knife
    • Plate
    • Paper towel

Related Articles

Extract Your Own DNA and More With These Awesome Science...
Topics for a Science Project: What Fruit Has the Most...
What Color Would a Tester PH Paper Turn if Is Dipped...
PH Levels of Fruit
List of Acidic Liquids
How to Measure the Voltage in Fruits
What Turns pH Paper Green?
What Is the Function of Litmus Paper?
How Do Fruit Batteries Power an LED Light?
How to Measure the Acidity of Soft Drinks
How to Make a Simple Dry Cell Battery
Science Fair Project: Dehydrating Fruit
How to Standardize a pH Meter
What Do the Colors Indicate on a pH Test Strip Paper?
The Properties of Acidic Substances
Uses of Acids & Bases
Water pH & Pollution
Methods on How to Determine pH in pH Paper
The Common Uses for Tartaric Acid
Definition of Acidic Solution
Can Fruits Make Electricity?