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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 else can I help you with?
Why EDTA ia secondary standard?
EDTA is considered a secondary standard because its purity needs to be verified by titration with a primary standard solution to determine its exact concentration. This is due to the fact that EDTA is hygroscopic and its concentration can vary due to absorption of moisture from the atmosphere.
Is borax a primary standard?
No, borax is not considered a primary standard. Primary standards are highly pure reagents that can be used to standardize solutions for volumetric analysis, while borax is typically used as a secondary standard for acid-base titrations.
Is disodium salt considered as a primary standard?
No, disodium salt is not typically considered a primary standard in analytical chemistry. Primary standards are highly pure compounds that can be used to accurately determine the concentration of a known substance in a solution. Disodium salt is more commonly used as a secondary standard or as a reagent in laboratory experiments.
Why iodine is not considered as a primary standard?
Iodine is not considered a primary standard because it can undergo sublimation (solid to gas phase transition) and has a limited solubility in water, which can lead to inaccuracies in volumetric analyses. Additionally, iodine can react slowly over time with air and other compounds, affecting its stability and reliability as a primary standard.
Is hcl praimary standard or secondary standard?
Hydrochloric acid (HCl) is considered a primary standard because it is a highly pure compound that can be used directly to prepare standard solutions for titrations and other analytical procedures without the need for standardization.
Why EDTA ia secondary standard?
EDTA is considered a secondary standard because its purity needs to be verified by titration with a primary standard solution to determine its exact concentration. This is due to the fact that EDTA is hygroscopic and its concentration can vary due to absorption of moisture from the atmosphere.
Why edta is secondary stadard?
EDTA (ethylenediaminetetraacetic acid) is not a secondary standard. It is a chelating agent commonly used as a titrant in complexometric titrations to determine metal ions in solution. The stability and selectivity of EDTA complexes make it a primary standard for this purpose.
What would be a better alternative to zinc sulphate as a primary standard for EDTA?
A better alternative to zinc sulfate as a primary standard for EDTA titrations is typically disodium hydrogen phosphate dihydrate (Na2HPO4∙2H2O), also known as disodium phosphate. This compound is preferred due to its higher purity, stability, and lower tendency to form complexes with EDTA compared to zinc sulfate.
Is borax a primary standard?
No, borax is not considered a primary standard. Primary standards are highly pure reagents that can be used to standardize solutions for volumetric analysis, while borax is typically used as a secondary standard for acid-base titrations.
Is disodium salt considered as a primary standard?
No, disodium salt is not typically considered a primary standard in analytical chemistry. Primary standards are highly pure compounds that can be used to accurately determine the concentration of a known substance in a solution. Disodium salt is more commonly used as a secondary standard or as a reagent in laboratory experiments.
Why iodine is not considered as a primary standard?
Iodine is not considered a primary standard because it can undergo sublimation (solid to gas phase transition) and has a limited solubility in water, which can lead to inaccuracies in volumetric analyses. Additionally, iodine can react slowly over time with air and other compounds, affecting its stability and reliability as a primary standard.
Is standardising EDTA and creating a standard solution the same thing?
Yes, these expressions are synonyms.
Is hcl praimary standard or secondary standard?
Hydrochloric acid (HCl) is considered a primary standard because it is a highly pure compound that can be used directly to prepare standard solutions for titrations and other analytical procedures without the need for standardization.
WHY IS BORAX CONSIDERED A PRIMARY STANDARD?
Borax is considered a primary standard because it is a solid compound with a high degree of purity, a high molecular weight, and stable chemical properties. These characteristics make it suitable for accurately measuring the concentration of acids or bases in a titration procedure.
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 sodium thiosulphate solution a primary standard?
No, sodium thiosulfate solution is not typically considered a primary standard. It is commonly used as a titrant in redox titrations rather than as a primary standard due to its susceptibility to oxidation by air. Primary standards are typically pure, stable compounds that can be used to standardize solutions.
Why Mohr's salt is considered a primary standard?
Mohr's salt (ammonium iron(II) sulfate) is considered a primary standard because it is a highly pure and stable compound that can be easily weighed and dissolved to make a standard solution. It has a high molar mass and is stable in air, making it suitable for accurate titrations.
