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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.
A buffer keeps something where it should be. It buffers adverse swings. It shields, cushions and protects. If you have ever seen a pH test strip for a swimming pool, you will note a section of the strip that states pH which will give a direct pH reading, and a section of the strip that states total alkalinity.