Acid-base titration is a widely used technique in chemistry to determine the concentration of an unknown acid or base solution. In this practical investigation, we will be using acid-base titration to determine the concentration of a hydrochloric acid solution. By reacting a known volume of the acid solution with a standard solution of a base, and using an indicator to determine the endpoint of the reaction, we can calculate the concentration of the unknown acid solution. This technique has important applications in many areas of chemistry, making it an essential part of any chemistry curriculum. In this blog post, we will explain the scientific principles behind acid-base titration, the equipment needed, step-by-step instructions, expected findings, and model calculations. We will also answer some common questions related to acid-base titration, including the purpose of using an indicator and how to calculate the concentration of an unknown solution. Whether you are a student or a chemistry enthusiast, this post will help you understand acid-base titration and its importance in the world of chemistry.