How to Use pH Strips to Test Water

Lemon juice is acidic and rates a two to three on the pH scale.
••• レモン image by Reika from

pH strips allow you to test the acidity of a liquid. The strips measure on a scale of 14, where seven is neutral. Lower numbers are increasingly acidic, while higher numbers are increasingly alkaline (or basic). Water, being a neutral liquid, should register a seven. If a pH strip shows that it is another number, you know that the water is not pure. pH strips are fast and easy to use.

    Fill a beaker with the water that you wish to test. Make sure that the beaker is completely clean of foreign contaminants that may affect your test.

    Tear off a pH strip from the pack.

    Dip the strip into the water briefly. The time required depends on the brand of strips that you are using. Some strips require 20 seconds while others need only one, so read the instructions carefully.

    Remove the strip from the water after the appropriate amount of time has elapsed.

    Compare the color of the strip to the chart provided with the strips. Acids are represented with warmer colors (red, orange, etc) while alkalines are represented with cooler colors (blue, green, etc).

    Things You'll Need

    • Universal pH strip
    • pH chart on box


    • Some strips are designed to test a smaller portion of the pH scale. Make sure you get strips that test the entire range.

Related Articles

How to Measure pH Levels
What Do the Colors Indicate on a pH Test Strip Paper?
How to Calculate the pH of Lemon Juice
Advantages of Using a pH Meter
How to Measure pH Levels
What Is pH of Sodium Carbonate in Water?
How to Standardize a pH Meter
How to Raise the PH Level in Water
What Color Would a Tester PH Paper Turn if Is Dipped...
Different Ways to Raise the pH of Drinking Water
How to Know When a Titration Is Complete
How to Raise the Alkalinity in a Freshwater Aquarium
What Is the Function of Litmus Paper?
Methods on How to Determine pH in pH Paper
How Can pH Affect Your Fish?
How to Use Litmus Papers
How to Make Water Clear After Adding Food Coloring
Methods for Testing PH of Liquids
How to Dissolve EDTA in Water
How to Tell If a Sample of Water Is Pure or Mixed