Phenol red indicator solution, 6.5-8.5 pH, 100mL, MDB

Product #: 21132
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Phenol Red Indicator Solution in a 100 mL Marked Dropping Bottle provides an easy-to-use colorimetric method for determining pH levels for neutral and slightly alkaline waters in the range of 6.5 to 8.5 units. This method uses a color wheel and is especially useful for testing swimming pools and spas. Maintaining a pH level below 8 helps control algae growth, while a pH below 7.4 is optimal for chlorine disinfection. However, if the pH drops below 7.0, it can cause corrosion of pipes and metal. More than 6 mg/L of chlorine can interfere with this phenol red pH test, so to remove chlorine from the sample, add one drop of 0.1 N sodium thiosulfate solution (PN 2700832) per 5-mL of sample, mix, and then add the Phenol Red pH indicator, as this procedure will remove up to 50 mg/L of chlorine from the sample. Colorless pH 7 Buffer (PN 1222249) is used as the control standard in this method.


Used in the Pool Master Test Kit 2315001, Color Wheel Kit 147008.


In addition to these applications, Phenol Red is also used for monitoring ground and river water quality, making it a versatile tool for various environmental water quality testing needs.

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