Chemistry - Complete P-block Question with Solution | TestHub

The use of Borate Buffer (pH 9.2) is for the estimation of $O_3$ (ozone). Borate buffers are commonly used in analytical chemistry, especially in methods involving spectrophotometry or electrochemistry, where a stable alkaline pH is required.

Explanation:

Borate buffer at pH 9.2 provides a stable alkaline environment. This is crucial for certain analytical reactions, such as the spectrophotometric determination of ozone ($O_3$) using methods like the indigo trisulfonate method, where the reaction proceeds optimally at a specific pH.