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Chapter 35: Problem 17

Discuss the following: (a) Masking of ions (b) Selection of EDTA titrations (c) Equivalence point (d) Internal indicator

Short Answer

Expert verified
The four terms are essential elements in chemical analysis, particularly in titration experiments. Masking is used to avoid interference of irons. EDTA titrations provide a convenient method for determining concentration of metal ions. The equivalence point indicates the completion of reaction. An Internal indicator is used to signify the completion of the reaction.

Step by step solution

01

Explain Masking of ions

Masking is a process used in EDTA titrations to prevent certain ions from interfering in the titration process. It can be defined as the reaction of an ion with a suitable reagent to form a complex ion which does not react with the titrant.
02

Describing Selection of EDTA titrations

EDTA titrations are used when we need to determine the concentration of metal ions in a sample. Titrations with EDTA have been widely used in the analysis of natural waters and wastewater. The selection of EDTA for titration is made on the basis of its ability to form stable, soluble, colorless complexes with metal ions, which are detectable by changes in the metal ion’s properties.
03

Explain Equivalence Point

The equivalence point in a titration occurs when the quantity of titrant added is exactly enough to completely consume the analyte. In the context of EDTA titrations, the equivalence point is reached when all the ions susceptible to the titrant have reacted to form a complex. This is usually indicated by a color change which is perceptible by computational techniques.
04

Discuss Internal Indicator

An internal indicator is a substance whose color changes at or very close to the equivalence point of a chemical reaction. It is used in titrations to indicate when all the reactants have reacted and the reaction has stopped. In the context of EDTA titrations, the metal-ion indicator must form a weaker complex with the titrating ion than does EDTA and the color change should be sharp and easily observable.

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