Homework Answers
Question 1.
there are basically 2 types of EDTA titration
- Direct titration
- Back titration
When the cation is directly titrated against the standard EDTA solution it is known as direct titration.
And when excess of EDTA solution is added of known value and then it is back titrated using another standard solutions like zinc.
In both the cases EBT also known as erichrome black T indicator is used.
When the direct titration is possible it is done but when it is not possible i.e. when a proper indicator is not present and cation bonds to EDTA to form stable conplexes back titration method is used.
Question 2.
To know what is firnation constant of calcium with EDTA we first must know what is formation constant
formation constant-
The equilibrium constant value which tells us about the stability of reaction between a metal and a ligand (Ca and EDTA in our case)
The formation constant for EDTA and Ca2+ is 10.65
Since this value is high means it is strongly attached to EDTA to form ligand and hence there will be no suitable indicator and we have to use the back titration method instead of direct titration.
I hope this helps if you have any query or want more detailed explanation feel free to ask in the comments section below.
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2. Calculate the concentration of one liter of the resulting
calcium chloride solution (assuming you started with 102.7 mg of
calcium carbonate) in units of molar and millimolar. Also calculate
the concentration in “parts-per-million as CaCO3”. (Refer to
section 13.5 of your textbook, if needed.)
a. If a standard Ca2+ solution is 100 ppm and 50 mL of solution
is used for the standardization, calculate the approximate volume
of 2.5 mM EDTA4- solution needed to reach the end point of...
i am insure what are the correct answers for this one
EDTA Titration 1. EDTA (cthylenediaminetetraacetic 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 Ca, Mg and other metal ions with EDTA. During the titration, ammonium-ammonia chloride buffer is often used. Which of the following descriptions about the function of ammonium-ammonia chloride is/are correct? (a) To react with EDTA To form...
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