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What indications did the experiment results give regarding the purity of the sample used?
The experiment results indicated the purity of the sample by showing how closely the measured properties matched the expected values for the pure substance. Any deviations or impurities detected in the results would suggest a lack of purity in the sample used for the experiment.
Explain the rationale for using a reversed phase C18 column for the determination of caffeine?
A reversed phase C18 column is commonly used for the determination of caffeine due to its hydrophobic properties, which can efficiently separate caffeine from other compounds in the sample based on their differing affinities for the stationary phase. Caffeine, being relatively nonpolar, interacts strongly with the C18 column, allowing for good retention and separation. Additionally, C18 columns are compatible with common mobile phases used in high-performance liquid chromatography (HPLC), making them a popular choice for caffeine analysis.
Citric acid-purity by titration?
To determine the purity of citric acid by titration, you would need to titrate a known concentration of a base (such as NaOH) with a solution of citric acid. The amount of base required to neutralize the citric acid can be used to calculate the purity of the citric acid sample. The purity can be calculated by comparing the experimental results to the theoretical stoichiometry of the reaction.
To test the purity of calcium chloride you dissolve a 3.77g sample in water and add silver perchlorate to precipitate out silver chloride.?
By adding silver perchlorate, any chloride ions present in the solution will react with the silver ions to form silver chloride precipitate. The mass of silver chloride can be measured to determine the amount of chloride present, which can then be used to calculate the purity of the calcium chloride sample.
Percent purity greater than 100 percent?
A percent purity greater than 100 percent is not physically possible because it implies that the sample contains more of the substance than it actually does. This could be due to errors in the measurement or calculation process, and it is important to double-check the methods used to determine the purity of the substance.
What indications did the experiment results give regarding the purity of the sample used?
The experiment results indicated the purity of the sample by showing how closely the measured properties matched the expected values for the pure substance. Any deviations or impurities detected in the results would suggest a lack of purity in the sample used for the experiment.
What are the two techniques used in paper chromatography to identify caffeine in tea?
The two techniques used in paper chromatography to identify caffeine in tea are stationary phase and mobile phase. In stationary phase, a sheet of filter paper is used to hold the sample, while in mobile phase, a solvent is used to carry the sample along the paper. These techniques separate the components of the sample based on their affinity for the stationary and mobile phases.
What instrument measures the purity of Argon gas?
An argon gas analyzer measures the purity of Argon gas. The analyzer can be used to determine the actual content of Argon gas in a specific sample.
What is a criterion based sample?
A criterion-based sample is a non-probability sampling method where participants are selected based on specific characteristics or criteria relevant to the research study. This approach ensures that the sample reflects particular traits that align with the research objectives, enhancing the relevance and validity of the findings. It is commonly used in qualitative research, where the focus is on understanding a particular phenomenon or group rather than generalizing to a larger population.
What is a touch stone?
A touchstone is a black stone used to test the purity of gold and silver by examining the streak left on the stone when rubbed against the metal. It is also often used metaphorically to refer to a standard or criterion for evaluating something.
Why is the wavelength 275 nm used to measure absorbance of caffeine?
The wavelength of 275 nm is used to measure absorbance of caffeine because it corresponds to the maximum absorbance peak for caffeine. By using a wavelength where caffeine absorbs strongly, we can accurately measure its concentration in a sample based on the amount of light absorbed at 275 nm.
What is peak purity index?
Peak purity index is a measure used to assess the homogeneity of a peak in chromatographic analysis. It compares the absorbance or response of a peak at different points within the peak to determine its purity. A peak with a high peak purity index indicates that the analyte in the sample is pure and unaffected by co-eluting substances.
How do you test the purity of milk using Archimedes principle?
Lactometer is a device used for finding the purity of a milk sample. It works on the principle of Archimede's principle that a solid suspended in a fluid will be buoyed up by a force equal to the weight of the fluid displaced. If the milk sample is pure, then the lactometer floats on it and if it is adulterated or impure, then the lactometer sinks.
Is what your age a criterion deficiency?
Age is not a factor in criterion deficiency. Criterion deficiency is a secondary measure used to assess job performance skills as well as competency skills.
What criterion is used for naming the trapezius?
the shape
Explain the rationale for using a reversed phase C18 column for the determination of caffeine?
A reversed phase C18 column is commonly used for the determination of caffeine due to its hydrophobic properties, which can efficiently separate caffeine from other compounds in the sample based on their differing affinities for the stationary phase. Caffeine, being relatively nonpolar, interacts strongly with the C18 column, allowing for good retention and separation. Additionally, C18 columns are compatible with common mobile phases used in high-performance liquid chromatography (HPLC), making them a popular choice for caffeine analysis.
How would one determine whether a given sample of aspirin is pure or not?
One way to determine the purity of aspirin is through a melting point test. A pure sample of aspirin will have a specific melting point range, so comparing the observed melting point to the known range can indicate purity. Additionally, techniques such as chromatography or spectroscopy can be used to analyze the composition of the sample.
