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Chapter 4: Problem 70

Distilled water must be used in the gravimetric analysis of chlorides. Why?

Short Answer

Expert verified
Distilled water is used in the gravimetric analysis of chlorides to avoid any interference from other ions that might be present in non-distilled water. The presence of other ions can interfere with the precipitation process which is crucial for determining the amount of chloride ions present, hence it could lead to inaccuracies in the results.

Step by step solution

01

Understanding gravimetric analysis

Gravimetric analysis is a method in analytical chemistry to determine the amount of an analyte (the ion being analyzed) based on the mass of a solid. In the case of chloride ions, they are usually precipitated and then converted into a solid of known composition that can be weighed.
02

Role of distilled water

Distilled water is pure H2O without any other ions present. The chlorides in the sample will not react with anything in the distilled water. During the precipitation process (where chloride ions are converted into a weighing form), impurities present in non-distilled water can also be precipitated and cause inaccuracies in the measurement.
03

Effect of non-distilled water

If non-distilled water is used, it can introduce other ions that might react with chlorides or the reagent used during the analysis. This can interfere with the analysis, hence resulting in an error in calculation of the amount of chloride ions present in the sample.

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