Which indicator is used to check the pH level in water?

Phenol Red is an indicator commonly used to check the pH level in water, particularly in contexts such as aquaculture, swimming pools, and laboratory settings. It changes color depending on the pH level of the solution, providing a clear visual representation of the acidity or alkalinity of the water. Phenol Red transitions between yellow in acidic conditions (below pH 6.8) and pink to red in neutral to alkaline conditions (above pH 8.2), making it a useful tool for measuring pH in a variety of applications.

While other indicators, like litmus paper or universal indicators, can also assess pH, they work under different principles or are tailored for specific pH ranges. Litmus paper is less precise as it only indicates whether a solution is acidic or basic without providing a specific pH value. Universal indicators provide a broader range but may not be as straightforward as Phenol Red for certain applications. Bromothymol Blue is another acid-base indicator, but its color range (yellow to blue) is utilized primarily in a more limited pH range (around pH 6.0 to 7.6), which may not be suitable for all water testing scenarios.

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