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What condition should use the standard addition method?
The standard addition method is typically used in analytical chemistry when analyzing samples with unknown concentrations, where a known amount of standard solution is added to the sample to create a series of solutions with different concentrations. This method is particularly useful when the matrix of the sample interferes with other quantitative methods.
Which sample had the lowest final temperature?
Sample B had the lowest final temperature.
How calibration curve is obtained using flame spectrophotometer?
A calibration curve for a flame spectrophotometer is obtained by measuring the absorbance of a series of standard solutions with known concentrations of the analyte. The instrument records the absorbance values at specific wavelengths. By plotting the absorbance against the concentration of the standard solutions, a linear calibration curve is achieved. This curve can then be used to determine the concentration of an unknown sample based on its absorbance value.
What is spectrochemical analysis and how do you use calibration curves?
Spectrochemical analysis is a method that involves using spectroscopic techniques to identify and quantify the chemical composition of a sample. Calibration curves are used in spectrochemical analysis to establish a relationship between the concentration of a known standard solution and the corresponding signal intensity measured by the spectrometer. By plotting a series of standard solutions with known concentrations and their corresponding signal intensities, a calibration curve is generated to help quantify the amount of an analyte in an unknown sample based on its measured signal intensity.
How would a contaminated unknown sample affect the accurate identification of the unknown?
A contaminated unknown sample could potentially introduce foreign material that may interfere with the identification process. This contamination could lead to misleading results or hinder the ability to correctly identify the unknown sample. It is important to ensure the sample is pure and free from contamination for accurate identification.
What condition should use the standard addition method?
The standard addition method is typically used in analytical chemistry when analyzing samples with unknown concentrations, where a known amount of standard solution is added to the sample to create a series of solutions with different concentrations. This method is particularly useful when the matrix of the sample interferes with other quantitative methods.
How can one calculate the unknown concentration from a standard curve?
To calculate the unknown concentration from a standard curve, you first need to plot a graph with known concentrations and corresponding measurements. Then, you can use the equation of the line to determine the concentration of the unknown sample based on its measurement.
Why has he put the red blue and yellow paints next to the unkown paint chromatography?
The red, blue, and yellow paints are used as reference standard colors for comparison with the unknown paint sample after chromatography. By comparing the colors from the unknown sample to the standard colors, it helps in identifying the components present in the unknown sample based on their chromatographic separation pattern.
How can one determine the concentration of a sample using a calibration curve?
To determine the concentration of a sample using a calibration curve, you first need to measure the response of known standard samples with known concentrations. Then, plot a calibration curve by graphing the response against the concentration. Finally, measure the response of the unknown sample and use the calibration curve to determine its concentration by finding where its response falls on the curve.
When the population standard deviation is not known the sampling distribution is a?
If the samples are drawn frm a normal population, when the population standard deviation is unknown and estimated by the sample standard deviation, the sampling distribution of the sample means follow a t-distribution.
What is the difference between t-distribution and standard normal distribution?
the t distributions take into account the variability of the sample standard deviations. I think that it is now common to use the t distribution when the population standard deviation is unknown, regardless of the sample size.
When to use z or t-distribution?
If the sample size is large (>30) or the population standard deviation is known, we use the z-distribution.If the sample sie is small and the population standard deviation is unknown, we use the t-distribution
Which sample had the lowest final temperature?
Sample B had the lowest final temperature.
How do you make a standard curve graph?
Standard curves are used to determine the concentration of substances. First you perform an assay with various known concentrations of a substance you are trying to measure. The response might be optical density, luminescence, fluorescence, radioactivity or something else. Graph these data to make a standard curve - concentration on the X axis, and assay measurement on the Y axis. Also perform the same assay with your unknown samples. You want to know the concentration of the substance in each of these unknown samples. To analyze the data, fit a line or curve through the standards. For each unknown, read across the graph from the spot on the Y-axis that corresponds to the assay measurement of the unknown until you intersect the standard curve. Read down the graph until you intersect the X-axis. The concentration of substance in the unknown sample is the value on the X-axis. In the example below, the unknown sample had 1208 counts per minute, so the concentration of the hormone is 0.236 micromolar. Prism makes it very easy to fit your standard curve, and to read (interpolate) the concentration of unknown samples.
How does one calculate the standard error of the sample mean?
Standard error of the sample mean is calculated dividing the the sample estimate of population standard deviation ("sample standard deviation") by the square root of sample size.
What term is used in forensics to describe a sample of unknown origin?
The term used in forensics to describe a sample of unknown origin is "questioned sample."
What is a flame tested used for?
To identify an unknown sample by its emission spectrum
