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: Cu Absorbance 1 Absorbance 2 Absorbance 3 Mean + SD standard (ppm) 0.0522 0.1013 1 0.0521 0.0520…
A: To determine the concentration of metal in unknown sample, we must first plot the mean absorbance (y…
Q: 1. What's the slope of the calibration curve? 3.95 x 10-5 4.17x10-5 1 20484 25257 2. What's the…
A: The linear regression equation of the calibration curve is: Y = 25257X - 114.32
Q: A spectrophotometric method for the quantitative determination of the concentration of Pb2+ in blood…
A:
Q: 100 ml boiled cooled and filtered water sample takes 9.6 ml of M/50 EDTA in titration. The…
A: The hardness degree can be calculated in term of CaCO3 equivalent asDegree of Hardness=Wt. of…
Q: (3) In a titration, the % analyte is computed from the following equation: Vol (titrant) x M…
A:
Q: Write functions and procedure of analysis of various volatile organic molecules by using Gas…
A: Given: Functions and procedure of analysis of various volatile organic molecules by using Gas…
Q: What is the value of pk, for the fluoride anion, F at 25°C? Ka(HF) = 7.1 x 10-4? Express your answer…
A:
Q: What are the advantages and disadvantages of volumetric and gravimetric analysis
A: Gravimetric analysis is a very accurate quantitative analysis .Advantages of gravimetric analysis…
Q: 1. Replicate water samples are analyzed for water hardness with the following results: 102.2, 102.8,…
A: Q1) # Hardness ppm Deviation from mean Square of deviation 1 102.2 0.4 0.16 2 102.8 0.2 0.04…
Q: What are the criteria for a successful determination in gravimetric analysis?
A: Gravimetric analysis is a technique through which the amount of an analyte (the ion being analyzed)…
Q: The melting point of various ratios of mixtures of urea and acetaminophen) were determined and the…
A: We will plot concentration (%) on y axis and melting point on x axis. Moreover, the melting point…
Q: To quantify the amount of ethanol in a beverage, a technician prepared the first solution which…
A: Gas chromatography (GC) is an analytical technique that is used for detection and quantification of…
Q: For the calculation of sd, shouldn't it be (0.97-1.09) and so on... because 0.97 = x and 1.09 =…
A: The general equation to find the standard deviation is: ∑i=2n(Xi-μ)2NwhereXi = Experimental valuesμ…
Q: A second spectrophotometric method for the quantitative analysis of Pb2+ in blood yields an Ssamp of…
A: The value of sensitivity of the method for the analyte (kA) is calculated using sample signal…
Q: Find the following: 1. slope and intercept of the calibration curve 2. the mean concentration of…
A:
Q: what is the purpose of BSC Level 1 & 2, proper layout, performance, and its application in biosafety…
A: Biosafety labs deal with infectious diseases.when workings with infectious materials, proper safety…
Q: A scientist wishes to measure the concentration of methyl benzoate in a plant stream by gas…
A: We are given for peak A of methyl benzoate of 1.37 mg/ml gave an area of 301, and peak B of butyl…
Q: A method for the determination of the corticosteroid methylprednisolone acetate in solutions…
A: given: n = Zα22S2E2 where α2= (1-confidence level )2 =0.025 Zα2 = 1.9599…
Q: 4 litres of water obtained from a borewell in Vellore contains FeSO4 = 30.4 mg; CaSO4 = 13.6 mg;…
A:
Q: Nacl: NaCl dissolution: (aq) predicted AS value for NaCl dissolution: NaNO3: NANO3 dissolution:…
A: In the given question solid, liquid and gasesuos state find
Q: Tube Dilution pH (acid) [H+] 10-1 (aseq) Hd 13 [H+] 1. 2. 10X 1.92 12.05 11.12 10^-2 3. 100X 2.75…
A: Introduction: As per Bronsted-Lowry concept, an acid is a substance that can donate H+ ions and base…
Q: Compare Statement A with Statement B The molar absorptivity of X is 2.50. Statement A: 0.50 M X in a…
A: According to Lambert Beer's law, absorbance (A) of a solution is given by the relation below: A =…
Q: (Concentration) You are tasked to prepare 300.000 ppb of a sodium carbonate standard for a…
A: Parts per billion (ppb) concentration is defined as: mass of solute (in grams)volume of solution (in…
Q: A 0.1 M solution of acid was used to titrate 10 ml of 0.1 M solution of alkali and the following…
A: Given data :- 0.1 M solution of acid was used to titrate 10 ml of 0.1 M solution of alkali Volumes…
Q: The gravimetric factor used to express CoCBr6·H20 in a sample that is finally weighed as PbClBr is…
A: Gravimetric factor
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: A titration was carried out to determine the volume of base needed to neutralize an acid. Five runs…
A: The neutralization reaction or the acid-base reaction is often employed as the basis for determining…
Q: Q) Calculate the “Chlorine Demand of Water”, if “addition of (i.e. Chlorine added)” 200 kg/d of…
A:
Q: A scientist wishes to measure the concentration of methyl benzoate in a plant stream by gas…
A: Case 1: Methyl benzoate is represented by A and Butyl benzoate is represented by B. Calculation of…
Q: A scientist wishes to measure the concentration of methyl benzoate in a plant stream by gas…
A: The given type of aanylysis called the Single Point Internal Standard method. Internal response…
Q: What volume of 2 M Tris-HCl, pH 8.0 (in microliters) will you need in order to make 10 mL of 10 mM…
A:
Q: The peak integrations of a chromatogram resulting from a GC analysis of a mixture containing…
A: Area under the curve of GC is correspond to mass of that component.
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: A scientist wishes to measure the concentration of methyl benzoate in a plant stream by gas…
A: The given data are, 1. Priliminary run, Concentration of methyl benzoate, MMB1=1.37 mg/mL…
Q: f an instrument gives a response of 1240 for a standard containing 8 ppm of a substance, how much if…
A: The given question can be solved by using the unitary method. The assumption that we are taking is-…
Q: A compound X is to be determined by UV/visible spectrophotometry. A calibration curve is…
A: Calibration curve in Beer's law plot is drawn by taking Absorbance(A) on Y-axis and concentration(C)…
Q: ± 0.00098 18 Bromocresol green 0.08641 ± 0.00113 29 Is the difference between indicators
A: 95 % confidence interval for a population mean can be represented as
Q: Identify the effect of the condition on the indicated parameter. Write increase, decrease, or no…
A: Here,we are measuring heat of reaction by reacting reactants with nitric acid.
Q: statement is correct?
A: In Analytical Chemistry, an internal standard is defined as a chemical substance that is added to…
Q: A quantitative analysis for an analyte gives a mean concentration of 12.6 ppm. The standard…
A: In the statistics of sampling, the sampling variance versus overall variance is having a formula,…
Q: 2. Describe the underlying principles behind the complexometric determination of water hardness.…
A: Water is pure when nothing is added to it, but it becomes hard when the calcium and magnesium ions…
Q: Table 1-4: Spectrophotometric readings of a dye dilution series m of Dye A620 Reading of Sample A…
A: We are given absorbance reading for sample-A and sample-B for different mass values of the dye. We…
Q: Plot Density(g/mL) vs Mass (g) 20 18 y = 10.01x -0.017 R² = 1 16 14 12 10 6 0.2 0.4 0.6 0.8 1 1.2…
A:
Q: 100 Membrane Potential 50 아 1-50 .100 K+ Membrane Current 300 1200 100 of -200 Na+ 3 msec -300…
A: The above picture is of axon potential picture.The function of nervous system is sensation,…
Q: What weight of mercury bichloride should be taken as sample, assuming 100% purity, so that 0.5 g og…
A: Weight is calculated as, (weight of sample * GF)/ Weight of analyte.
Q: The homogeneity of the chloride level in a water sample from a lake was tested by analyzing portions…
A: Solution -
Q: Which of the following methods of preparing 0.0010M HCl solution from 1.0M stock HCl Solution will…
A: The task is to determine overall uncertainty while preparing 0.0010 M HCl solution from 1.0 M stock…
Q: A standard curve for glucose analysis was prepared.The slope (m) was found to be 1.341 while the…
A: Given: Slope(m) = 1.341 y-intercept = -0.333 Absorbance (y) = 0.151
Q: The homogeneity of the chloride level in a water sample from a lake was tested by analyzing por-…
A:
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-1cm1. (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)Norepinephrine can be analyzed in human urine. A fixed amount of DHBA was added to each sample and standard in a fixed concentration. Please explain the analytical function of adding DHBA. To the 1 mL of urine sample, small amounts of 1 µg/mL norepinephrine standard is added and the following results were obtained. What is the concentration of the norepinephrine in the urine sample with uncertainty?You determine the acetic acid (HOAc) content of vinegar by titrating with a sodium hydroxide standard solution to a phenolphthalein (an indicator) end point. An approximately 5-mL sample of vinegar is weighed on an analytical balance in a weighing boat and this is found to be 5.0268 g. The standard deviation in making a single weighing is 0.2 mg. The sodium hydroxide must be accurately standardised (this means its concentration must be accurately determined) by titrating known mass of high-purity potassium hydrogen phthalate, and three such titrations give molar concentrations of 0.1167, 0.1163 and 0.1164 mol L-1. A volume of 36.78 mL of sodium hydroxide is used to titrate each sample. The standard deviation of the burette used is 0.02 mL. Calculate the percentage of acetic acid in the vinegar and its standard deviation.
- 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 aboveYou 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.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?
- 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?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).(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?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/molA 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?