This document describes methods for estimating various vitamins and acetic acid from samples. It discusses estimating vitamins A, B, and C using different techniques like HPLC, colorimetric, and spectrophotometric methods. For vitamin A, it provides details on the Carr-Price colorimetric method. It also outlines procedures for determining vitamins B using fluorimetric and spectrophotometric methods. Finally, it summarizes a titration process for estimating the concentration of acetic acid in vinegar using sodium hydroxide and a phenolphthalein indicator.