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www.sciencebuddies.org/science-fair-projects/references/acids-bases-the-ph-scale

They consist of a probe that is dipped in a solution, and a digital readout. pH meters are even more precise than pH test paper or indicator sticks. Table 2 below discusses what types of pH measuring devices are best for different science project applications, and offers a quick link to purchasing different pH test papers and indicator sticks.

www.epa.gov/sites/production/files/2015-10/documents/1622624.pdf

generally, pH levels were measured before the arrival of the contaminant plume and found to range between 6.5 and 7.6. When the contaminated water from the mine release passed a sampling location, the pH lowered (indicating more acid) to approximately 4.8 (below Silverton). A pH of 4.5 is consistent with the pH of a liquid like black coffee.

sciencing.com/methods-testing-ph-liquids-5809509.html

One interesting method of testing the pH of a liquid uses red cabbage juice as a pH indicator. When the cabbage juice is mixed with different liquids, the solution changes color thanks to a pigment in red cabbage called flavin – an anthocyanin. If the color changes to pink, the pH is 1 to 2. If the color becomes dark red, the pH is 3 to 4.

www.thoughtco.com/ph-of-common-chemicals-603666

pH is a measure of how acidic or basic a chemical is when it's in aqueous (water) solution.A neutral pH value (neither an acid nor a base) is 7. Substances with a pH greater than 7 up to 14 are considered bases. Chemicals with a pH lower than 7 down to 0 are considered acids.The closer the pH is to 0 or 14, the greater its acidity or basicity, respectively.

sciencing.com/science-experiments-ph-levels-9174.html

Testing the pH level of a substance tells you if that substance is acidic, basic or neutral. The pH scale ranges from 1 to 14; 7 is neutral, lower numbers are acidic, and higher numbers are basic. Science experiments on pH levels help investigators determine the pH level of a given material and how that level might affect the environment.

www.answers.com/Q/What_are_the_pH_levels_of_different_household_liquids

While the pH is a useful descriptor of a chemical property, it is a poor descriptor of chemical hazard. Two liquids with the same pH, say 4.6, can have very different "levels" of hazard.

serc.carleton.edu/sp/mnstep/activities/27573.html

This activity is a classroom lab where students test common household liquids for pH level on the pH continuum, 1-14. They compare and contrast everyday use of the liquids, and how this relates to the liquids' pH property.

phet.colorado.edu/en/simulation/ph-scale-basics

Test the pH of everyday liquids such as coffee, spit, and soap to determine whether each is acidic, basic, or neutral. Investigate how adding more of a liquid or diluting with water affects pH.

www.pmel.noaa.gov/co2/file/The+pH+scale+with+some+common+examples

The pH scale, with examples of common solutions and their pH values. Download/View For commercial use please contact us

www.education.com/science-fair/article/testing-ph-levels

The goal of the pH level project is for students to understand the varying levels of acidity in various substances. Students should also be asked to consider the connection between pH levels and toxicity (example: pH levels of stream water or blood). What materials are required? pH test paper (1-14 range preferably) (6 strips per student)