An analysis of city drinking water for total hardness was done by two students in the laboratory and produced the following results (in ppm CaCO3): Student A: 228.3, 226.4, 226.9, 227.1, and 228.6. Student B: 229.5, 226.1, 230.7, 223.8, and 227.5 what is the coefficient variation?
Q: What is the median of the values 7.79, 8.24, 5.81, 4.97, 1.04, 7.39, and 7.22?
A: Median value can be calculated as:
Q: The following is a standard solution of phosphorus (P) data measured by a spectrophotometer. ppm P…
A: The absorbance v/s concentration in ppm data given is, Given: Mass of Na2HPO4 sample = 2.1 g.…
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 titrimetric method for the determination of calcium in limestone was tested with the analysis of a…
A:
Q: Analytical chemist from Petroleum Development Oman extracted petroleum from crude oil and measured…
A: Please have a look into the solution:
Q: Analysis of a chromatogram of a mixture containing 0.0124 M analyte and 0.0448 M standard found that…
A: Known concentration of analyte = 0.0124 M Initial concentration of standard = 0.0448 M Area of…
Q: A sample is selected from a population with µ = 46, and a treatment is administered to the sample.…
A: Solution:-The sample mean before treatment, μ1 = 46 The sample mean after treatment, μ2 = 48The…
Q: professor Scimemi has accepted you as a Master’s student and you are involved in a project that…
A: You need to make 2.5 mM KCl. The formula for weighing is as follows: Amount of KCl (g) = [Molarity…
Q: (a) For use in an iodine titration, you prepare a solution from 0.222 2 (+0.000 2) g of KIO3 [FM…
A: The relative uncertainity in the weight and formula mass of KIO3 can be calculated as follows:
Q: A chemist analyzes a sample of iron ore furnished by the National Institute of Standards and…
A: Given data x- =10.52 %s = 0.05n= 10NIST's value of the sample is 10.60% Fe
Q: 1. a. Calculate the mass of BaSO4 required to make 50.00 mL of a 0.1500 M solution. b. Calculate the…
A: Molarity is the amount of substance that is added in particular volume of solution. Molarity =…
Q: You determine the acetic acid (HOAc) content of vinegar by titrating with a sodium hydroxide…
A: Step by step Explanation- The average of molar concentration is calculated as shown below M(NaOH)=…
Q: Analytical chemistry is a particular field within the broader spectrum of the chemical sciences, in…
A: Answer :---- In a analytical chemistry standardization is a crucial process and it is used to…
Q: Norepinephrine can be analyzed in human urine. A fixed amount of DHBA was added to each sample and…
A: The objective of the question is to understand the analytical function of adding DHBA in the…
Q: What are the differences between systematic and random errors and how do they effect accuracy and…
A: As per the Bartleby guidelines, an expert is allowed to answer one question at a time. Please repost…
Q: An analysis of city drinking water for total hardness was done by two students in the laboratory and…
A: We are given data : For student A: 228.3, 226.4, 226.9, 227.1, and 228.6. And For student B:…
Q: Eight replicate measurements were made on a test solution producing the following results for the…
A:
Q: What is the median of the values 6.12, 7.00, 7.59, 4.11, 5.00, 5.02, and 9.56?
A:
Q: A titrimetric method for the determination of calcium in limestone was tested by analysis of an NIST…
A: The confidence interval can be calculated using the following formula:
Q: Question: Using a method for the determination of % CaO in limestone the following results were…
A: There are numerous molecules in inorganic chemistry. Every molecule has molecular formula as well as…
Q: In the Analytical Chemistry laboratory, one of the B.Sc student Ms. Fatma wanted to analyze the…
A: Spectrophotometer
Q: 2. The analytical ability of two lab technicians was compared by having each perform analyses for…
A: Given DataAnalyst As.d = 0.12 %N=6Analyst Bs.d. =0.06 %N=5To determine:whether these results suggest…
Q: A 0.2 g sample of NazC204 consumed 30.92 mL of KMNO4 to reach the faint pink endpoint in the…
A:
Q: In a survey of 1000 large corporations, 250 said that, given a choice between a job candidate who…
A:
Q: What is the 95% confidence interval for the mean of the data, assuming
A: (χi - μ) (χi - μ)2 1 3.55 0.10 0.010678 2 3.65 0.20 0.041344 3 3.14 -0.31 0.094044 Mean…
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: What is the absolute uncertainty and relative uncertainty of the molarity of the solution? M =…
A:
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: 2) In the Analytical Chemistry Laboratory Mr.Yahiya Al Moqbali wanted to prepare KCI solution. He…
A: Molarity =(mass of substance/molecular mass )x1000/Volume in ml Molecular mass = 74.551 Volume…
Q: You are preparing a 100.0 mL standard solution needed for titration analysis. The NaOH (40 g/mol)…
A: ff
Q: In the Analytical Chemistry laboratory, one of the B.Sc student Ms. Fatma wanted to analyze the…
A: (i) Given: Dilution factor is 10. The volume of solution B(diluted solution) is 250 mL.…
Q: A chemist working in a hospital clinical laboratory obtained the following values for uric acid in…
A: The given values are 4.63, 4.58, 4.82, 4.31, 4.67 and 4.60 mg To find: Mean value
Q: A procedure for measuring the amount of creatinine in blood was applied to a standard blood sample…
A: The explanation is given below-
An analysis of city drinking water for total hardness was done by two students in the laboratory and produced the following results (in ppm CaCO3):
Student A: 228.3, 226.4, 226.9, 227.1, and 228.6.
Student B: 229.5, 226.1, 230.7, 223.8, and 227.5
what is the coefficient variation?
Step by step
Solved in 3 steps with 2 images
- In the Analytical Chemistry laboratory, one of the B.Sc student Ms. Fatma wanted to analyze the presence of Iron(II) ion in the water samples collected from Sohar Industrial Area in the Sultanate of Oman and analyzed by Spectrophotometric method. (1) 250.00 mL of this water sample (Solution A) known to contain unknown amount of FeSO4. She has diluted Solution A by a dilution factor 10 to make 250.00 mL solution, which she labeled Solution B. Using Spectrophotometer, she has measured the absorbance value (0.642) for Solution B at 508 nm using 1.00 cm cell (cuvet). The molar absorptivity value for Fe2* ion at 508 nm is ɛ508 = 30.8 M-1cm-1. (i) What volume of the solution A did she require to make the 250.00 mL of Solution В? (ii) in (i)? What instrument should she use to transfer the volume of the Solution A calculated (ii) Concentration of FeSO4 in Solution B. (iv) Concentration of FeSO4 in Solution A. Mass of FeSO4 in Solution A (Show your calculation) (v)Analysis of a chromatogram of a mixture containing 0.0124 M analyte and 0.0448 M standard found that the peak area from the analyte was 324 and that the peak area from the standard was 258. In another experiment, a solution containing an unknown concentration of analyte and 0.0381 M standard was analyzed. The peak area of the analyte was 231, and the peak area of the standard was 197. What is the molar concentration of the unknown?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
- You are preparing a 100.0 mL standard solution needed for titration analysis. The NaOH (40 g/mol) pellets are measured to be 0.5341 g in a balance with acceptable uncertainty of +0.001 g. Mass of the pellets is recorded after taring the container. The pellets are put in a beaker and added with 50 ml distilled water measured by a graduated cylinder. The solution is then quantitatively transferred to a 100-mL volumetric flask with uncertainty of ±0.08 mL and diluted to a 100-mL mark. What is the concentration (M) of the solution and estimate its uncertainty by propagation? Assumption: There is no uncertainty in molar mass. Express your answer as C+/- u M.An analysis of city drinking water for total hardness was done by two students in the laboratory and produced the following results (in ppm CaCO3): Student A: 228.3, 226.4, 226.9, 227.1, and 228.6. Student B: 229.5, 226.1, 230.7, 223.8, and 227.5What is the 95% confidence interval for the mean?(a) For use in an iodine titration, you prepare a solution from 0.222 2 (+0.000 2) g of KIO3 [FM 214.001 0 (+0.000 9)] in 50.00 (+0.05) mL. Find the molarity and its uncertainty with an appropriate number of significant figures. (b) Would your answer be affected significantly if the reagent were only 99.9% pure?
- A 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?Acetic acid percentages in five vinegar samples were 4.98, 4.86, 4.97, 4.99. 5.08, 5.11, 4.97, 5.32 and 4.89. Could we reject any of these values with 95% confidence? Q critical = experimental Q = Therefore (yes or no) the suspicious data can be rejected (write the value of the data that can be deleted, example 5.08).The standard solution is prepared by dissolving a known mass of zinc pellets with conc. HCl. The solution is then neutralized, transferred into a 250 mL volumetric flask and filled to the calibration mark. If 0.9809 g of Zn was weighed using an electronic balance with a relative uncertainty of ± 0.01 % and the 250 mL volumetric flask has a known relative uncertainty of ± 0.06 %, what would be the absolute uncertainty of the concentration of the solution? The molecular weight of the zinc pellets is 65.39 g/mol
- A titrimetric method for the determination of calcium in limestone was tested with the analysis of a NIST limestone containing 30.15% CaO. The mean of the four analyzes is 30.26% CaO with a standard deviation of 0.085%. From the data accumulated from many analyzes, s→ϭ=0.094% CaO was found.a) Do the data indicate the presence of systematic error at the 95% confidence level?b) When a value for ϭ is unknown, do the data show a systematic error at the 95% confidence level?A chemist working in a hospital clinical laboratory obtained the following values for uric acid in blood serum: 4.63, 4.58, 4.82, 4.31, 4.67 and 4.60 mg%. What value should be reported as the mean? Value of QT at 90 % confidence level is 0.56.Analytical chemist from Petroleum Development Oman extracted petroleum from crude oil and measured the quantity lost by the extraction to tell how much of the petroleum was. Quantity of Petroleum lost (%):10.8, 11.6, 9.4, 7.8, 9.2, 9.5, 10.6, 11.6Should the value 7.8 be rejected from the set of the above results.