What is the device called that measures the color intensity of a chemical solution?

The device that measures the color intensity of a chemical solution is a spectrophotometer. This instrument works by passing light through a sample and measuring the amount of light that is absorbed by the solution at specific wavelengths. The intensity of the color in a solution is directly related to the concentration of the chemical species present. As the concentration of a solute increases, the solution typically absorbs more light and appears more intense in color. Spectrophotometers provide a quantitative measurement that corresponds to this concentration, making them essential tools in various fields such as chemistry, biology, and environmental science for analyzing concentrations of substances in solution.

In contrast, options like chromatographs are used for separating components of a mixture rather than measuring color intensity. Fluorometers are designed to measure fluorescence, which is the emission of light by a substance that has absorbed light or other electromagnetic radiation, rather than direct absorption of light by a colored solution. Photoelectric sensors can detect light levels but do not provide the specific measurement of color intensity in chemical solutions as a spectrophotometer does.