Quantitative analysis student Jon analyzed an ore sample for its lead content and obtained a mean of 4.75% Pb for five measurements. If the certified true value is 4.50%, what is the (a) percent error? (b) percent accuracy?

Quantitative analysis student Jon analyzed an ore sample for its lead content and obtained a mean of 4.75% Pb for five measurements. If the certified true value is 4.50%, what is the (a) percent error? (b) percent accuracy?

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter5: Errors In Chemical Analyses

Section: Chapter Questions

Problem 5.9QAP

See similar textbooks

Related questions

Q: Acetic acid percentages in five vinegar samples were 4.98, 4.86, 4.97, 4.99. 5.08, 5.11, 4.97, 5.32…

A: To determine if any value can be rejected, we need to use Q-test.

Q: A solution is prepared by diluting 2.81 mL of the blue dye stock solution to 25.00 mL. The measured…

A: The data given is, Given: Volume of blue dye used = 2.81 mL. And the volume of final solution =…

Q: The instructor reveals that the weak acid is hypochlorous acid, HOCl. The known Ka for HOCl is…

Q: 9-20. Calculate the fraction of association (a) for 1.00×10-1, 1.00× 10-2, and 1.00×10-12 M sodium…

A: Sodium acetate: CH3COONa+H2O↔HA+NaOHDissociatinng strong components into their…

Q: The gold content of an ore is being measured. The results of these analyses are: Content (ppt)…

A: “Since you have posted a question with multiple sub-parts, we will solve the first three subparts…

Q: To determine the organic material in a dried lake bed, the percent carbon by mass is measured at two…

A: The explanation is given below-

Q: What is the importance of calibrating analytical balances?

A: Calibration of analytical balance is important.

Q: If you were pipetting 17.0 mL, what is the percent error in the pipet? I know that Volumetric…

A: To figure out percent error in the pipet we need to figure out maximum error in the pipet then we…

Q: What is the difference between a decigram balance and an analytical balance?

A: We have to write the main difference between the decigram balance and the analytical balance.

Q: You determined experimentally the density of a solution in triplicate. Considering the results what…

A: Standard deviation is calculated by using the formula s = ∑i=1n(Xi-X)2n-1s = standatd deviation X =…

Q: Eight replicate measurements were made on a test solution producing the following results for the…

Q: Using a 25mL pipette, you prepare a standard solution by pipetting 25.00mL of the standard iron…

A: All measurements contain 3 parts , that is -The measurement The uncertaintyThe unit The uncertainty…

Q: How many of the following should be included in a good hypothesis? (1) A prediction of the results…

A: A hypothesis can be defined as a proposed explanation for a phenomenon that has been observed.

Q: The color change of a chemical requires an overtitration of 0.04 mL. Calculate the percent relative…

A: Given, Experimental value = 50 mL + 0.04 mL = 50.04 mL True value = 50 mL Calculating the percent…

Q: Density Lab (Need help plotting this graph) How to plot this graph from the data sheet (see picture…

A: Density is given by, Density = Mass/volumeFrom the given table, they will ask to find…

Q: I am supposed to calculate Average absolute deviation (%). I am not sure if 7.16 is the final…

Q: Calculations: Use the following steps to calculate the percent mass of CaCO3 in an eggshell. Use the…

A: It is given that the molarity of NaOH is 0.046 M and the molarity for HCl taken is 1M, And the…

Q: What are the similarities in random error and systematic error? In analytical method and graphical…

A: Answer - Random error - Random error is a chance difference between the observed and true values of…

Q: A chemical industry discharges a waste contaminated with trichloroethylene (TCE) to the city sewer…

A: The concentration of TCE obeys the normal distribution. Mean, μ=0.064…

Q: A researcher has developed a new analytical method to determine the percent by mass on in solids. To…

Q: Write a step-by-step procedure for this serial dilution. • The stock concentration of the blue dye…

A: In this problem we need to prepare different concentrated solution from a particular solution given.…

Q: Q3: In a chromatographic analysis, a solution was prepared with 0.0837 M Octane (A) and 0.0666 M…

A: In the given question we have to calculate the concentration of octane in unknown sample.

Q: The method described in Problem 5-8 is to be used for the analysis of ores that assay about 1.2%…

A: Relative error percentage is defined as- Relative error %=|Measured value-Actual value|Actual…

Q: I need help with calculating the standard deviations and percent error-…

A: Standard deviation =∑xi -μ2Nxi = strength value at particular volumeμ = mean value N= number of…

Q: 2) As an example of precision and accuracy of data, suppose the % carbon in a single compound has…

A: Accuracy means the value comes close to actual true value and Precision means all the trial values…

Q: Analysis was run on samples from a known CRM with 8.85% Fe. The following results for %Fe were…

A: 1)The null and alternate hypothesis are: H0= (the analysis is accurate ) H1= (the analysis is not…

Q: The standard solution is prepared by dissolving a known mass of zinc pellets with conc. HCl. The…

A: Given information, Volume (V) = 250 mL = 0.25 L Mass of Zn (m) = 0.9809 g Molecular weight of the…

Q: Analyze each statement (A and B) whether they are true or false. Use the choices below in answering…

A: The given statements are, A) A dispersing agent such as Na-hexametaphosphate is needed prior to soil…

Q: QUESTION 2 Estimate the absolute deviation for the following calculation. The numbers in parantheses…

Q: 2. Quantitative analysis student Analytical analyzed an ore sample for its lead content and obtained…

A: Given, Experimental obtained mean value = 4.75 % True value = 4.50 %

Q: You have run analysis on an unknown acetaminophen sample. Your results showed the concentration of…

A: Given experimental concentration of acetaminophen = 35.9 % = 0.359 actual concentration of…

Q: Certified Reference Material (CRM), GSS-5, is certified to contain 40.67 ± 3.33 mg/kg of Ni in soil.…

Q: Assuming that you weighted a piece of silver five times and each time you got 52 grams. However, the…

Q: An excess of 0.34 mg Pb is obtained from an assay test determined in an analysis. What is the…

Q: A procedure for measuring the amount of creatinine in blood was applied to a standard blood sample…

A: The explanation is given below-

Question

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step by step

Solved in 2 steps with 1 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.

Similar questions

2. Quantitative analysis student Analytical analyzed an ore sample for its lead content and obtained a mean of 4.75% Pb for five measurements. If the certified true value is 4.50%, what is the (a) percent error? (b) percent accuracy?
Review Question 2)
A solution is prepared by diluting 2.81 mL of the blue dye stock solution to 25.00 mL. The measured absorbance for the prepared solution is listed in the data table. Measurement Result Blue dye stock solution 0.293 M Absorbance at 630 nm 0.00265 Calibration curve y=0.0833x Part: 0/3 Part 1 of 3 What is the theoretical molar concentration? Round your answer to 3 significant digits. [Blue]theoretical-M x10 X S Part: 1/3 Part 2 of 3 What is the experimental molar concentration? Round your answer to 3 significant digits. [Blue ] experimental M 9 Subm Ⓒ2022 McGraw Hill LLC. All Rights Reserved. Terms of Use Privacy Cent
Using a 25mL pipette, you prepare a standard solution by pipetting 25.00mL of the standard iron solution[0.25g/L] into a 500mL volumetric flask. Then, using a 10mL pipette you transfer a 4mL aliquot of this solution into a 50mL volumetric flask and dilute up to the mark. Calculate the % uncertainty. Question 1 options: 0.65 0.75 0.0075 0.45
Analyze each statement (A and B) whether they are true or false. Use the choices below in answering each item; A statement A is true B statement B is true C both A and B are true D neither A nor B are true (A) A dispersing agent such as Na-hexametaphosphate is needed prior to soil textural analysis. (B) particles greater than 2.0 mm is included in the analysis of soil texture.
Please show the work with the exact conversion factoring process. Thank you
An excess of 0.34 mg Pb is obtained from an assay test determined in an analysis. What is the percent relative error in ppt if the mass of the sample is 550 g?
(a) Use the following theoretical density values for copper and zinc metals (in g/mL) and the experimental density values you obtained in Question 12 to determine the percent error in each of your experimental values. Density of copper (theoretical) ρCu = 8.94 g/mL Density of zinc (theoretical) ΡZn = 7.14 g/mL The equation for percent error is: "%Error"=|"Experimental value - Theoretical value" /"Theoretical value" |×100 Show your work and calculated values, include units. (b) Suggest possible reasons for differences between the experimental and theoretical density values for each metal. 14. Describe any issues you had with the virtual lab, or any unrealistic situations you thought were funny. Also describe the benefits and deficiencies you seen in virtual labs compared to real lab experiences.
Identify two (2) possible errors during weighing a sample.
Chemistry plz answe both.
The color change of a chemical requires an overtitration of 0.04 mL. Calculate the percent relative error if the total volume of the titrant is 50 mL.
Eight replicate measurements were made on a test solution producing the following results for the concentration of sodium ion (mg/L): 63.91, 65.92, 69.98, 64.24, 65.45, 65.82, 66.51, 65.11. The value 69.98 is an outlier suspect. A Q-test at 95% confidence level will lead to this conclusion with respect to the suspect value: O Should be thrown away Should not be thrown away There is not enough data to draw a conclusion None of the above