pH indicator paper is a type of paper or strip that contains a special dye or indicator that changes color in response to the acidity or alkalinity (pH) of a solution. It is used to determine the pH level of a liquid.

pH indicator paper contains a chemical indicator that changes color based on the concentration of hydrogen ions (H+) in a solution. In acidic solutions, the paper turns one color, and in alkaline (basic) solutions, it turns another color. The color change corresponds to a specific pH range.

pH indicator paper is used to quickly and easily determine the pH of a solution. It is commonly used in laboratories, educational settings, and various industries to monitor the pH of substances like water, chemicals, and beverages.

To use pH indicator paper, you typically dip the paper into the solution you want to test or place a drop of the solution on the paper. The paper will change color, and you can compare the resulting color to a pH color chart that comes with the paper to determine the pH of the solution.

A pH color chart is a reference chart that accompanies pH indicator paper. It shows the range of colors the paper can turn and the corresponding pH values. By matching the color of the paper to the chart, you can estimate the pH of the solution.