Final answer:
A titrant is the chemical used to precipitate chloride ions in the Volumetric Determination of an Unknown Chloride experiment. It is a known concentration solution that is gradually added to the unknown sample until the equivalence point is reached.
Step-by-step explanation:
In the context of the experiment for the Volumetric Determination of an Unknown Chloride, a titrant is D) The chemical used to precipitate chloride ions. During a titration, this is a solution of a known concentration that is incrementally added to a sample containing the unknown substance. The titration process continues until the equivalence point is reached, at which point the concentration of the titrant and the volume added makes it possible to calculate the concentration, and subsequently the mass, of the unknown chloride.
An indicator may be used during the titration to visually detect the endpoint, which corresponds closely to the equivalence point. The equivalence point can also be detected by measuring specific properties of the solution that change predictably throughout the titration process.