in chromatography , when we add external standard to remove instrumental error , the calibration is...
in chromatography , when we add external standard to
remove instrumental error , the calibration is between relative
area and concentration
how is the relative area measured ? and how does the external
standard appear in the chromatogram when they are the typical same
substance
thanks
Homework Answers
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in chromatography , when we add external standard to
remove instrumental error , the calibration is...
Can I add error bars for one measurement? let's say that we have energy value for...
Can I add error bars for one measurement? let's say that we have energy value for each temperature degree, and when plotting the energy vs. temperature, we get a scatter plot. Can we add error bars to the point in this plot? or does the experiment has to be repeated in order to get multiple trials. In other words, Standard deviation and standard error are used in calculation and generating error bars. How these quantities are calculated if I only...
Error Propagation What is error propagation? A question in error propagation is that when we take...
Error Propagation What is error propagation? A question in error propagation is that when we take a product of measurements we do what with the uncertainties? Should our uncertainties get bigger or smaller as they propagate through the formulas? Take a square and measure one side. What happens to the uncertainties when you calculate Area? Can this be beneficial when our product contains measurements of different units? The rule is to find the relative uncertainty in a product of measurements...
III. Standard Curves When we want to determine the concentration of an unknown solution, we typically measure a certain...
III. Standard Curves When we want to determine the concentration of an unknown solution, we typically measure a certain property of standard solutions with our standard (known) solutions and create what's called a standard curve (or calibration curve). A standard curve relates two variables of certain known solutions. That way, when there is an unknown variable for a certain solution, it can be determined through the standard curve. When plotting standard curves, we always plot the independent variable on the...
Please explain what I should understand by comparing "percentage difference" with "relative standard error" values together? When is it a good sign, or when is it a bad sign for my col...
Please explain what I should understand by comparing "percentage difference" with "relative standard error" values together? When is it a good sign, or when is it a bad sign for my collected data? (I know that percentage difference and relative standard error are not the same as percent errors, so please do not involve percent error in your explanation.) Thanks for your help.
Beer’s Law Objective : We will explore an application of absorption spectroscopy using calibration curves and...
Beer’s Law Objective : We will explore an application of absorption spectroscopy using calibration curves and Beer’s Law. Use the “LAB : HOW TO…” link from the class website if you need help with how to use balance, Bunsen burner… and such. Introduction: You may write this information in your lab notebook for your own reference. It can’t be cut and pasted. Different solutions have different spectral properties. In this portion of the experiment those properties will be utilized to...
Case C Thin Layer Chromatography 1. TOXI-LAB is a screening method that uses: chromatography (column /...
Case C Thin Layer Chromatography 1. TOXI-LAB is a screening method that uses: chromatography (column / planar) The first step consists of the extraction of drug metabolites from biological fluids when we place the sample in a test tube containing a mixture of solvents and buffering salts that cause the extraction of basic and neutral drugs. The solvent extract of the sample is concentrated by heat and evaporation, then is deposited onto a small disc of chromatographic media (small circle...
5. Why do we want to know what the standard error of the sampling distribution equals? 6. When does a binomial distribu...
5. Why do we want to know what the standard error of the sampling distribution equals? 6. When does a binomial distribution begin to approximate a Poisson distribution? As discussed in class, what is the main reason we need to understand the normal distribution? 7. 8. There is a pipe-making machine. On any given day it averages about 5 errors for about 10,000 feet of pipe; however, it ends to make more errors in the morning when the machine is...
2. If two different compounds have the same Rr value, how might they be identified using paper chromatography?...
2. If two different compounds have the same Rr value, how might they be identified using paper chromatography? 3. Why is it important to keep the spots on the paper as small as possible? 4. If the solvent pool at the bottom of the beaker touched the spots on the 1.5cm line, what would happen to the spots? How would you address this error? 5. If you were teaching a student how to do paper chromatography, what three pieces of...
please help with no 3,4,5 and 6 Thanks 1. What is standard error? Measure of statistical...
please help with no 3,4,5 and 6
Thanks
1. What is standard error? Measure of statistical accuracy of an estimate, equal to the standard deviation of the theorental distribution of a large populanon of such estimates 2. What calculation is used to describe the variation in measurements. 3. In experiment 3.2. You will be measuring out 40ml of volume. How many times will you measure 40 ml? 4. What is the difference for each time you measure out 40ml? In...
__________ was described as the "number of unique or useful pieces of information we have when...
__________ was described as the "number of unique or useful pieces of information we have when estimating population parameters." Sample size Significance level Degrees of freedom Standard error In which of the following research situations, it is appropriate to use a matched-paired samples t-test as opposed to independent samples t-test. When there are same number of samples in the two conditions to be compared. When one can assume there is a causal relation between independent and dependent variables. When the...
Error Propagation What is error propagation? A question in error propagation is that when we take a product of measurements we do what with the uncertainties? Should our uncertainties get bigger or smaller as they propagate through the formulas? Take a square and measure one side. What happens to the uncertainties when you calculate Area? Can this be beneficial when our product contains measurements of different units? The rule is to find the relative uncertainty in a product of measurements...
III. Standard Curves When we want to determine the concentration of an unknown solution, we typically measure a certain property of standard solutions with our standard (known) solutions and create what's called a standard curve (or calibration curve). A standard curve relates two variables of certain known solutions. That way, when there is an unknown variable for a certain solution, it can be determined through the standard curve. When plotting standard curves, we always plot the independent variable on the...
Case C Thin Layer Chromatography 1. TOXI-LAB is a screening method that uses: chromatography (column / planar) The first step consists of the extraction of drug metabolites from biological fluids when we place the sample in a test tube containing a mixture of solvents and buffering salts that cause the extraction of basic and neutral drugs. The solvent extract of the sample is concentrated by heat and evaporation, then is deposited onto a small disc of chromatographic media (small circle...
5. Why do we want to know what the standard error of the sampling distribution equals? 6. When does a binomial distribution begin to approximate a Poisson distribution? As discussed in class, what is the main reason we need to understand the normal distribution? 7. 8. There is a pipe-making machine. On any given day it averages about 5 errors for about 10,000 feet of pipe; however, it ends to make more errors in the morning when the machine is...
2. If two different compounds have the same Rr value, how might they be identified using paper chromatography? 3. Why is it important to keep the spots on the paper as small as possible? 4. If the solvent pool at the bottom of the beaker touched the spots on the 1.5cm line, what would happen to the spots? How would you address this error? 5. If you were teaching a student how to do paper chromatography, what three pieces of...
please help with no 3,4,5 and 6
Thanks
1. What is standard error? Measure of statistical accuracy of an estimate, equal to the standard deviation of the theorental distribution of a large populanon of such estimates 2. What calculation is used to describe the variation in measurements. 3. In experiment 3.2. You will be measuring out 40ml of volume. How many times will you measure 40 ml? 4. What is the difference for each time you measure out 40ml? In...
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