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Q: Why EDTA is secondary standard?
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Why EDTA ia secondary standard?

because EDTA is obey all conditions of primary standard except high purity


Why titration with standard hard water is carried out?

To determine concentration of EDTA.


Which form of EDTA is soluble in water?

EDTA used analytically is usually the disodium salt Na2H4Y 2H2O (372.24 g/mol), which is .... anyremaining EDTA titrant, Ca standard stock solution, and Zn unknown solution ...


Is standardising EDTA and creating a standard solution the same thing?

Yes, these expressions are synonyms.


Is EDTA considered as a primary standard?

No. Chemical compounds have to fulfill a number of requirements before they can be classified and used as a primary standard: A primary standard in chemistry is a reliable, readily quantified substance. Features of a primary standard include: 1. High purity 2. Stability (low reactivity) 3. Low hygroscopicity and efflorescence 4. High solubility (if used in titration) 5. High equivalent weight 6. Non-toxicity 7. Ready and cheap availability Edta and particularly the sodium salts of EDTA which are frequently used do not fulfill the first requirement. Therefore the solution of EDTA has to be standardised against a known and accepted primary standard.


What would be a better alternative to zinc sulphate as a primary standard for EDTA?

Zinc oxide wil also do..


What is secondary standard apparatus What are secondary apparatus?

one is specific


Why edta enhances the permeability by tris?

I don't know the actual answer.But the below information will help you get a right answer.try to improve/correct the answer: HCl is a secondary standard solution.It is used in acid-base solution.On the other hand,EDTA is dissolved in pH 8.0.That's a perfect match for the HCl.EDTA chelates divalent cations and helps to inhibit DNAse.Thus,it is possible to get intake DNA. arif ashraf-biochem-DU-BD


Is hcl praimary standard or secondary standard?

HCl is not used as a primary standard


Determination of fe3 with EDTA by photometric titration?

Iron (III) ions form a deep-coloured complex with a maximum absorption at about 525nm; this complex is used as the basis for the photometric titration of iron(III) ion with standard EDTA solution.


HSC is tenth or 12th?

HSC is Higher Secondary Certificate which is 12th standard.....10th standard is called as SSC that is Senior Secondary Certificate.


Why EDTA is not dissolved in water?

EDTA is soluble in water.