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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.
Basics Of pH Control. FUNDAMENTAL CONSIDERATIONS. By definition, pH is the negative logarithm of the. hydrogen-ion concentration in aqueous solution. This. means that a solution having a pH value of 4 has ten. times more hydrogen ions than a solution whose pH is. 5. For control systems neutralizing spent acids or. bases, pH value per se is of little consequence except.