What calibration method is used in the given scenario and what is the analyte's concentration in the new sample solution?
The calibration method used in this question is the internal standard method. The analyte's concentration in the new sample solution is 0.146 M.
Calibration Method: Internal Standard Method
The calibration method used in this question is the internal standard method. In this method, a known amount of a substance called the internal standard is added to both the standard solutions and the unknown sample. The ratio of the analyte's peak area to the internal standard's peak area is then used to calculate the concentration of the analyte in the unknown sample.
Calculating Ratio:
Given that the peak area of the analyte in the mixture solution is 1.988 and the peak area of the internal standard is 2.508, we can calculate the ratio of the analyte's peak area to the internal standard's peak area:
Ratio = Analyte Peak Area / Internal Standard Peak Area = 1.988 / 2.508 = 0.792
Determination of Analyte Concentration in New Sample Solution:
Next, we add sufficient internal standard to the new sample solution to make its concentration 0.185 M. The peak area of the analyte in this new sample is 0.987, and the peak area of the internal standard is 1.981. Using the ratio calculated earlier, we can determine the concentration of the analyte in the new sample:
Analyte Concentration = Ratio * Internal Standard Concentration = 0.792 * 0.185 M = 0.146 M
By using the internal standard method and calculating the ratio of peak areas, we were able to accurately determine the analyte's concentration in the new sample solution. This method is commonly used in chromatography analysis to ensure precise and reliable results.