Write the balanced chemical equation for the reaction that is taking place between the titrant and analyte. This necessarily requires knowledge of the identity of the titrant and analyte. A common experiment in high-school and college chemistry labs is the titration of acetic acid (CH?COOH, the analyte) in a sample of vinegar with sodium hydroxide (NaOH, the titrant) (See References 2). This is a common acid-base reaction:
1 CH?COOH + 1 NaOH ? 1 CH?COONa + 1 H?O
The coefficients (i.e., the numbers to the left of each chemical) establish the molar ratio of the reactants. In this case, the molar ratio is 1:1.