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Water What-ifs
pH Color Charts

pH Color Charts

The determination of the pH of a substance is the measurement of the H+ ions found in that particular substance. pH is determined and recorded as a number between 0 and 14. Testing of pH level can be done in various ways and each method will have its own color chart for determining pH.

The following color charts are provided as a guide. Remember that different monitor color settings and different printers may cause the colors to look different.

LaMotte Octet Comparator
3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0
Bromthymol Blue (aquarium test indicator)
6.4 6.8 7.0 7.2 7.6
Garden soil test indicator
4.0 5.0 6.0 7.0 8-9 10
Red Cabbage Juice
Beakman's World has an acid rain activity which shows a color chart for red cabbage juice indicator.

1-2 3-4 5-6 7-9 10-11 12-13
pHydrion papers, 3.0-5.5

3.0 3.5 4.0 4.5 5.0 5.5
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©1998 April J. Cleveland for Science Junction, NC State University. All rights reserved.
page design by Lisa Leonor Grable and April J. Cleveland
Last Modified: 8/13/01

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