Classify whether the following is an Instrumental error, Method error, Personal error, Indeterminate error or Gross error and explain. A group of students are doing an analysis of copper in 1-peso coin. They were tasked to prepare standard solutions and weigh the analyte as the end-product of their experiment. Marikit had very good precision but poor accuracy in her data. Volumetric flasks were placed inside the oven for drying before it was used. Trial 1 and 2 have values close to 30.0 mL while trial 3 gave 55.0 mL. The reagent used in determining copper was added incorrectly and gave a low yield.

Classify whether the following is an Instrumental error, Method error, Personal error, Indeterminate error or Gross error and explain. A group of students are doing an analysis of copper in 1-peso coin. They were tasked to prepare standard solutions and weigh the analyte as the end-product of their experiment. Marikit had very good precision but poor accuracy in her data. Volumetric flasks were placed inside the oven for drying before it was used. Trial 1 and 2 have values close to 30.0 mL while trial 3 gave 55.0 mL. The reagent used in determining copper was added incorrectly and gave a low yield.

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

ChapterA: Scientific Notation And Experimental Error

Section: Chapter Questions

Problem 8P

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Classify whether the following is an Instrumental error, Method error, Personal error, Indeterminate error or Gross error and explain. A group of students are doing an analysis of copper in 1-peso coin. They were tasked to prepare standard solutions and weigh the analyte as the end-product of their experiment. Makisig forgot to calibrate the analytical balance before weighing. Only one trial was performed in the experiment. One member inadvertently recorded 29.90 mL instead of 19.90 mL volume. Marikit had very good precision but poor accuracy in her data. Volumetric flasks were placed inside the oven for drying before it was used. Trial 1 and 2 have values close to 30.0 mL while trial 3 gave 55.0 mL. The reagent used in determining copper was added incorrectly and gave a low yield.
Individually weigh each of the nine nickels used in part 2b. Then calculate the average,average deviation, and standard deviation of the nine samples. The mass of a U. S. nickel,when minted, is 5.000 g. What is the percent error between your average and the U. S. Mintvalue? Pay close attention to your significant figures when doing these calculations. Sample Mass (g) Average Mass ____________ gNo.1 _5.029 ______ Average Deviation ____________ g2 _5.010 ______ Standard Deviation ____________ g3 _4.983 ______ Percent Error ____________ %4 _5.036 ______5 _4.989 ______6 _5.026 ______7 _5.028 ______8 _4.980 ______9 _4.952 ______ im having issues with average deviation and standard deviation
A. A group of students are doing an analysis of copper in 1-peso coin. They were tasked to prepare standard solutions and weigh the analyte as the end-product of their experiment. Explain the type of error they are incurring in their experiment. A. Marikit had very good precision but poor accuracy in her data. B. Volumetric flasks were placed inside the oven for drying before it was used. C. Trial 1 and 2 have values close to 30.0 mL while trial 3 gave 55.0 mL. D. The reagent used in determining copper was added incorrectly and gave a low yield.
(When answering this problem, report the answer with the appropriate number of significant figures. When entering units, use proper abbreviated units with proper capitalization.)A beverage drink mix sample is prepared by mixing a packet of beverage powder in a gallon (3.78 L) of water. A sample for analysis is prepared by diluting 10.00 mL of this solution in a 50.0 mL volumetric flask. When measured using a colorimeter, this diluted solution has an absorbance of (3.49x10^-1). The calibration curve for the experiment yielded a linear fit of y = 21655x+(1.7950x10^-2) and an R2 value of 0.9911. Determine the molar concentration of food dye in the analyzed sample. Hint: The answer is assumed to be reduced to the highest power possible.
When answering this problem, report the answer with the appropriate number of significant figures. When entering units, use proper abbreviated units with proper capitalization. A beverage drink mix sample is prepared by mixing a packet of beverage powder in a gallon (3.78 L) of water. A sample for analysis is prepared by diluting 10.00 mL of this solution in a 50.0 mL volumetric flask. When measured using a colorimeter, this diluted solution has an absorbance of (3.49x10^-1). The calibration curve for the experiment yielded a linear fit of y = (2.650x10^4)x+(4.215x10^-2) and an R2 value of 0.9911. Determine the molar concentration of food dye in the analyzed sample
Answer in scientific notation with appropriate sigfigs. A drink mix sample is prepared by mixing a packet of beverage powder in a gallon (3.78 L) of water. A sample for analysis is prepared by diluting 10.00 mL of this solution in a 50.0 mL volumetric flask. When measured using a colorimeter, this diluted solution has an absorbance of (3.49x10^-1). The calibration curve for the experiment yielded a linear fit of y = (2.650x10^4)x+(4.215x10^-2) and an R2 value of 0.9911. Determine the molar concentration of food dye in the sample.
In reading the measurements provided by the volumetric apparatus, the eye must be at the same level as that of the meniscus to avoid: Critical ErrorParallel ErrorParallax ErrorOptical ErrorVisual Error
The gold content of an ore is being measured. The results of these analyses are: Content (ppt) 20.065 19.999 21.054 20.533 20.088 20.112 What is the average value, standard deviation and confidence interval for this set of data?Show each step of the calculation. Using your results calculate the %accuracy and %precision (relative standard deviation) if the true value is 20.045%.
Julie has been asked to measure the concentration of a sample solution using a spectrophotometer. After a first attempt, she realizes that, to make the measurement, she must first dilute the sample solution. Julie transfers 1.3 mL1.3 mL of the sample to a 250 mL250 mL volumetric flask and fills the rest of the flask with water to the 250 mL250 mL line. She then uses the spectrophotometer to measure the concentration of the dilute solution as 5.5×10−5 M.5.5×10−5 M. What is the concentration of the starting sample solution?
The method described above is to be used for the analysis of ores that assay about 1.2% gold. What minimum sample mass should be taken if the relative error resulting from a 0.4-mg loss is not to exceed a. -0.1% b. -0.8%
Julie has been asked to measure the concentration of a sample solution using a spectrophotometer. After a first attempt, she realizes that, to make the measurement, she must first dilute the sample solution. Julie transfers 2.3 mL2.3 mL of the sample to a 250 mL250 mL volumetric flask and fills the rest of the flask with water to the 250 mL250 mL line. She then uses the spectrophotometer to measure the concentration of the dilute solution as 5.5×10−5 M.5.5×10−5 M. What is the concentration of the starting sample solution? sample solution concentration: M
A student dissolves a Jefferson nickel to make 100.00 mL of solution in a volumetric flask. The student takes a 5.00 mL5.00 mL aliquot of the first solution and dilutes it to make 100.00 mL100.00 mL of a second solution. The student places a sample of the second solution in a cuvette for analysis using spectrophotometry. The molarity of the copper solution in the cuvette was determined by spectrophotometric analysis to be 2.90×10−2 M Cu.2.90×10−2 M Cu. Calculate the mass of copper in the Jefferson nickel used to make the first solution.