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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.
To use the visual method is simple. A pH sensitive indicator is placed in the measured solution and the indicator will change color depending on the pH level. To get the pH value, compare the color to the pH chart that comes with the indicator.The accuracy of this method is, for obvious reasons, low. However, it can be used for a rough estimation of the pH level. The pH indicator can either be a chemical indicator or a special pH paper, so-called pH testing strips.etermine the pH level. A common method to measure the pH level is to use a pH indicator and the related pH color chart. There are several methods to measure pH. However, the two most common methods are the indicator, or visual method, and the potentiometric method.