EDTA (ethylenediaminetetraacetic acid) is the most widely used metal chelator in
ID: 488706 • Letter: E
Question
EDTA (ethylenediaminetetraacetic acid) is the most widely used metal chelator in analytical chemistry, which forms strong 1:1 complexes with most metal ions. Water hardness can be determined by titrating Ca2+, Mg2+ and other metal ions with EDTA. During the titration, ammonium-ammonium chloride buffer is often used.
Which of the following descriptions about the function of ammonium-ammonium chloride is/are correct?
correct not correct To form complex with Ca2+ and Mg2+
correct not correct To maintain the pH of the solution around 10
correct not correct To minimize the affect of other metal ions
correct not correct To be used as a metal ion indicator
Explanation / Answer
correct not correct To be used as a metal ion indicator .
Like Acid-Base indicators that were simply another acid or base, that had a color change between forms, Metal Ion indicators are metal complexing agents that have one when it binds a metal ion but it may have several different colors when it is not bound to the metal.
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