If you spike the sample you collected with a known amount of the analyte of interest, you are probably using which of the following calibration methods? standar addition standard blank external standard internal standard standard spike
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- The amount of ascorbic acid in cashew juice of different brands was determined by two different methods, colorimetry and titrometry. The results obtained for the two methods for analyzing the different cashew juice are necessary in the following table. Sample Colorimetry (mg/100g) Titrometry (mg/100g) juice brand A 152,2 153,7 juice brand B 150,7 150,7 juice brand C 18,7 18,7 juice brand D 67,4 67,4 Can the two methods be used, indistinctly, to determine ascorbic acid in cashew juice, at a 95% confidence level? Explain.What are the differences between systematic and random errors and how do they effect accuracy and precision? In what circumstances would you use standard addition (versus a normal calibration curve) to determine the amount of an analyte in a sample? A urine sample, containing analyte Z is analysed by the standard addition method where 5 mL of the original sample was mixed with increasing amounts of a Z standard and each solution diluted to a volume of 50 mL prior to analysis. A plot of the final concentration of the standard in each of the 50 mL samples (x axis) versus The measured signal from the analysis of each 50 mL sample (on y axis) produced a straight line with the general equation: y = 44.72x + 4.06 what was the final concentration of Z in the 50 mL standard addition sample? what was the initial concentration of Z in the original urine sample?#9: This unknown contains 51.90 % C and 9.80 % H by mass with the remainder being an unknown element (you have to figure out what element). 100- Base 80 60 90 Relative Intensity 100 TRANSNETTANCE 40 20- O 4000 10 20 3000 30 peak 656 50 40 m/z REVENUTER 60 1300 peak 094 92-37= 90-35= C) 70 80 1000 90
- The instructor reveals that the weak acid is hypochlorous acid, HOCl. The known Ka for HOCl is 4.0×10-8. What is the percent error in the experiment?2) As an example of precision and accuracy of data, suppose the % carbon in a single compound has been measured thrce separate times by 2 different students. The theoretical % carbon is 21.34%. Student 1: trial 1:26.11%, trial 2: 26.24% trial 3: 25.92 %, Avg - 26.09 Student 2: trial 1: 20.35%. trial 2: 22.64 % trial 3: 19.79 %. Avg = 20.93 a) Which student had the more precise data and how can you tell? b) Which student had the more accurate data and how can you tell? 3a) Calculate the % error of Student 1 data in problem 2 above. Show all work below. WATCH SIG FIGSFor EACH type of gravimetric analysis:Give actual applications of each analysis. Include the SPECIFIC methodology for each sample chosen.
- Student A determines the percent acetic acid in their sample to be 4.31% and they report a standard deviation of 0.57. Student B also reports a value of 4.31 % acetic acid, with a standard deviation of 1.2. Which student (A or B) has the more reliable determination? Briefly, 1 - 2 sentences,8) Two different analytical methods are compared for determining Ca. The following are two sets of data. Set 1 Set 2 155.779 155.784 155.787 155.787 155.813 155.765 155.781 155.793 i. i. Determine the mean and the standard deviation in Set 1. Calculate the 95% confidence limit for data in Set 1. Identify a possible outlier in Set 2. Use the Q-test to determine whether it can be retained or rejected at 95% confidence level. ii.(9.29 × 105/8)-20.81 = with correct sig figs
- Suppose that a lead determination has a standard deviation of 3 mg. If the sample has a mean value of 60 mg, the CV is 5%. For a sample containing only 15 mg, the CV isA titrimetric method for the determination of calcium in limestone was tested by analysis of an NIST limestone containing 30.15% CaO. The mean result of four analyses was 30.26% CaO, with a standard deviation of 0.085%. By pooling data from several analyses, it was established that s = 0.094% CaO.a. Do the data indicate the presence of a systematic error at the 95% confidence level?b. Do the data indicate the presence of systematic error at the 95% confidence level if no pooled value for s was available?In a volumetric determination of an analyte A, the data obtained and their standard deviations are as follows: Initial buret reading 0.19 mL 0.02 mL Final buret reading 7.86 mL 0.03 mL Sample mass 63.0 mg 0.2 mg From the data, find the coefficient of variation of the final result for the %A that is obtained by using the equation that follows and assuming there is no uncertainty in the equivalent mass. %A= titrant volume x equivalent mass x 100 %/ sample mass Coefficient of variation = Submit Answer % Try Another Version 10 item attempts remaining