What is the pH indication of nitric acid when using pH strips?

The correct choice of red reflects the acidic nature of nitric acid when using pH strips. pH strips are designed to change color based on the acidity or alkalinity of a solution; they usually have a color scale that indicates varying pH levels. Nitric acid, being a strong acid, has a pH value typically below 1, which corresponds to a color change towards the red end of the scale.

In the context of the pH spectrum, a color shift to red signifies a low pH, confirming that the solution is acidic. This knowledge is crucial for technicians handling hazardous materials, as understanding the properties of acids and their correct identification through pH testing is essential for safety and proper response procedures.