Concentrated HCl is not considered a primary standard material because it tends to be hygroscopic, meaning it absorbs water from the atmosphere, leading to inaccuracies in the weighing process. Additionally, concentrated HCl can be prone to decomposition over time, which affects its stability for accurate standardization. For these reasons, it is more common to use a certified primary standard like potassium hydrogen phthalate or sodium carbonate for acid-base titrations.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Sodium thiosulfate is not considered a primary standard because its purity can be affected by oxidation upon exposure to air, making it difficult to accurately determine its concentration. Additionally, it is hygroscopic, meaning it can absorb moisture from the atmosphere, further affecting its purity and concentration over time.
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.
K2CrO4 is a secondary standard. This is because it is not directly titrated against a primary standard but rather is standardized by titration against a primary standard, such as sodium thiosulfate in iodometric titrations.
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.
A primary standard solution is a highly purified compound that is used as a reference material for accurately determining the concentration of another solution through titration. It is typically used in titration experiments due to its known high purity and stability.
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.