Soil pH Protocol
http://www.globe.gov/tctg/soilph.pdf?sectionId=97

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The purpose of this resource is to measure the pH of a soil horizon. Students mix dried and sieved soil samples with distilled water. The mixture is allowed to settle until a relatively clear layer is formed. Students use a pH pen, pH meter, or pH paper to determine the pH of the sample. The procedure is done three times for each horizon.

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Subject: Geoscience:Geology
Resource Type: Activities:Classroom Activity
Grade Level: Primary (K-2), Intermediate (3-5), Middle (6-8), High School (9-12)