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The pH strip is used for the determination of pH. The four colors on each strip correlate to. a pH range of 0 to 14. In the presence of fluid with normal pH (7.0), the strip willshow. the four colors of yellow-orange, orange, olive green, and yellow. In the presence of acidic. fluids (pH 5), the strip will display the four colors of yellow-orange, orange, tan and. yellow. The pH of gastric fluid is normally acidic.
Dip the pH test strip into the solution in the second container. 6. Compare the color on the pH test strip to the chart provided by the manufacturer to determine the pH of the sample.