A 5.12-g pesticide sample was decomposed and then dilute to 200-mL to determine its Cu2* contents. The analysis was completed by treating aliquots as indicated: Volume of sample, mL Volume of 3.82 ppm Cu²*, mL Signal 50.0 0.00 0.512 50.0 4.00 0.844 a. Calculate the percentage of copper in the pesticide sample.
Q: A volume of 250 ml of a 0.05 M solution of a reagent of formula weight (relative molecular mass) 40…
A:
Q: The copper in an aqueous sample was determined by atomic absorption flame spectrometry. First, 10.0…
A: Here we have to plot the graph based on standard addition. Given the copper concentration of the…
Q: The same chloride analysis but using a new method for which the standard deviation was not known,…
A:
Q: Calculate the [FeSCN2+] using volumes of stock solutions. Presume that all the SCN– ions react.…
A: The data given is,
Q: Table 1. Data on EDTA Standardization Weight of CaCO3 (g): 0.2003g Trial Volume of EDTA (mL)…
A: Each of Ca2+ is neutralised with 1 mol of EDTA. Also, No of moles = Mass / Molar mass
Q: in a standard addition calibration method, 50.0 ml volumetric flasks were used. A 5.0 ml aliquot of…
A:
Q: The amount of caffeine in an analgesic tablet was determined by HPLC using a normal calibration…
A: A question based on quantitative analysis, which is to be accomplished.
Q: A5.12-g pesticide sample was decomposed and then dilute to 200-ml to determine its Cu" contents. The…
A: Absorbance: It is a measure of the quantity of light that is absorbed by the sample. It is also…
Q: Example: A GC-FID analysis was conducted on a soil sample containing pollutant X. The following…
A: Answer -
Q: A 20 mM solution of ethanol is diluted 1 in 8. The diluted ethanol solution was used for an…
A: Volume of alcohol dehydrogenase in first experiment, V1 = 20 μL Initial velocity in first…
Q: A banned pesticide, DDT, is analyzed through gas chromatography. A DDT standard is diluted…
A: In analytical chemistry a calibration curve or standard curve, is plotted to determine the…
Q: Felodipine calcium channel blocker standard (0.251mg/ml) and felodipine sample (0.245mg/ml)…
A: Given that: concentration of felodipine standard = 0.251mg/ml concentration of felodipine sample =…
Q: from one of our neigboring countries are heavily contaminated with pesticides. Upon analysis, some…
A: WORKING OF SOLID PHASE MICROEXTRACTION :
Q: An analysis was carried out on a 1.5-gram sample of feed, the moisture was 28%, and when estimating…
A:
Q: The amount of caffeine in an analgesic tablet was determined by HPLC using a normal calibration…
A: On plotting the point in the graph,
Q: Question 2 a experiment on thermodynamics of borax.
A: 2) a) the dissolution reaction of AgCl (s) is given as AgCl (s) -----> Ag+ (aq) + Cl- (aq)…
Q: A sample of drinking water was tested for Pb+ and was found to have a Pb²* concentration of 17.46…
A: Given the concentration of the unspiked sample, Cunspiked = 17.46 ppb Now 1.00 mL of 2.29 ppb Pb2+…
Q: A sample of Coomassie Blue is prepared by mixing 20 µL of stock with 280 µL of 0.1 M Tris into a…
A: A=ϵcl ; where A = absorbency, ϵ= molar extinction coefficient and c = concentration of the solution…
Q: A 500. µl aliquot of a caffeine unknown is diluted to a total volume of 10.00 mL. A calibration…
A: The diluted solution has area = 3.07 mVcm Volume of diluted solution = 10 mL
Q: Analysis of Percent Organic Matter of * a soil sample was conducted and the data are shown below.…
A:
Q: A 0.937-g sample containing Ca2+ was dissolved to produce a 500-mL stock solution. A 50-mL aliquot…
A:
Q: Which of the following is correct? Select the correct response: HPLC columns are packed with…
A: Hplc
Q: Fluoride determination can be performed photometrically with alizarin red and Zirconium acid…
A: A question based on Beer-Lambert law, which is to be accomplished.
Q: Mercury intoxication could cause tremendous harmful impacts to human, particularly nervous system…
A: There are numerous instrumental techniques for quantitative and qualitative determination of the…
Q: 5) A 0.50 g soil sample was digested with 1.0 mL of HNO3-H2O2 mixture (1:1, v/v) and then diluted to…
A: The linear equation for copper calibration plot is: y = 0.04x + 0.0097 ________(1)
Q: II. Determination of Total Hardness of Water Source of water sample: Volume of water sample 22.00 mL…
A: Given that, Volume of EDTA solution consumed (V1)=14.06mL Molarity of standard EDTA solution used…
Q: Two different methods were investigated for Cu2+ detection in water sample and both methods…
A: To choose the correct option:
Q: Very pure silver nitrate standard reagent requires standardization with primary standard NaCl or KCl…
A: Silver nitrate standardization requires Nacl primary standard. It is true.
Q: A water sample was analyzed for Fe content using the iron- phenanthroline analysis: Reagent Blank…
A:
Q: An unknown was found to contain 10.80 ug of analyte per liter. A spike of 4.30 ug/L was added to a…
A:
Q: A 0.32 g soil sample was digested and diluted to 481-mL. The diluted sample was analyzed for Zn by…
A: We are authorised to solve only one question at a time. Please post rest of the questions…
Q: Use the data below from the titration of two water samples. Calculate the average ppm for the two…
A: Hardness of water is caused by polyvalent metallic cations, though the divalent cations, such as…
Q: An analyst was measuring the performance of a HPLC column. The test solute was Toluene (5 µL). The…
A: To find out the mobile phase velocity, number of theoretical plates and height equivalent to…
Q: Expt. 8: VOLUMETRIC DETERMINATION OF CALCIUM AS OXALATE Sample preparation: the sample is a solution…
A: In this experiment, we are doing volumetric determination of calcium oxalate.
Q: Calculate initial concentrations added to the test tube. (Fe+3 and SCN-1) 5 mL of 0.002 M Fe(NO3)3,…
A:
Q: are given a container with Na3PO3 that is reportedly contaminated. You are asked by your supervisor…
A: Since, first three parts of the questions are experimentally based, out of QA scope. Therefore, we…
Q: A graphite furnace atomic absorption spectrophotometer (AAS) was used to determine the arsenic (As)…
A: Given data Concentration Absorbance 2 0.17 4 0.28 6 0.48 8 0.53 10 0.72
Q: Weight of CaCO3 (g): 0.2003g Trial Volume of EDTA (mL) Molarity of EDTA (M) 1 8.60 2 8.50 8.55…
A: 1 mol EDTA neutralises 1 mol of CaCO3
Q: Chemistry A student measured concentrations of potassium ions in the solutions using flame…
A:
Q: 2. A water sample from a local cave system was tested for total water hardness. An EDTA titer was…
A: The question is based on the concept of complexometric titrations. We have to calculate hardness of…
Q: The protein concentration of a protein isolate was determined using the Bradford assay. Five…
A: A question based on tools in analytical chemistry that is to be accomplished.
Q: 9. ou wish to adapt the AA method to measure the amount of iron in leaf tissues. Theminimum amount…
A: A. Mass of leaf = 6.025 g Mass% of fe in the leaf =0.0025% Mass of fe in grams = Convert…
Q: statement is correct?
A: In Analytical Chemistry, an internal standard is defined as a chemical substance that is added to…
Q: Organic carbon in seawater can be measured by oxidation to CO2 with K2S2O8, followed by gravimetric…
A: Molar mass is defined as an average mass of atoms present in the chemical formula. It is the sum of…
Q: A 200 mL water sample was treated with SPE column for pe- concentration of a certain pesticide. The…
A: Introduction: High-performance liquid chromatography (HPLC) is an analytical technique to separate,…
Q: A 1.058-g sample of a copper unknown was dissolved in water and diluted to a final volume of 100.0…
A: STEP 1: Determine the concentration of the solution from the equation A = 8.58M. A = 0.529…
Q: method as follows: punty of an ibuprofen sample was determined by a reversed phase HPLC Y A…
A: Equation for the best-fit line of the calibration curve is: y=26820x-1323.8
Q: A sample of explosives residue is dissolved in an appropriate solvent and is injected into HPLC. The…
A: Introduction: Chromatography is a technique used to separate the mixture if solution. There are two…
Q: 3. This is the standard procedure for determination of nicotine in urine. A 1.00mL sample was placed…
A: A question based on tools in analytical chemistry that is to be accomplished.
Q: reparation of 0.25N NaOH Objective: Apparatus and Materials: Procedure : Calculate the exact mass…
A: 0.25N NaOH 1 litre N stands for normality To prepare normal solution, we take gram equivalent weight…
solve a
Step by step
Solved in 3 steps with 19 images
- A second spectrophotometric method for the quantitative analysis of Pb2+ in blood yields an Ssamp of 0.712 for a 5.00 mL sample of blood. After spiking the blood sample with 5.00 μL of a 1560 ppb Pb2+ external standard, an Sspike of 1.546 is measured. What is the concentration of Pb2+ in the original sample of blood?An analyst determines the Cl^- content of rain water with ion chromatography. The data for the calibration line in the range 5 to 50 milli equivalents per liter (mEq/L) is shown in the table below. Additionally, a blank sample was analysed 5 times and the following results obtained: 1.1, 0.5, 0.1, 0.9 and 1.2 ppm Ct Calculate the detection limit (DL) for the method with a 98.3% confidence level. Use ALL data and show equationsA new method is proposed to simultaneously detectand separatefour foodadditives by reversed-phase liquid chromatography. The data were obtained using theliquid chromatographic column with a flow rate of 0.5 mL per min and with the followingparameters: Pore size 100 A Particle Size 3.5 Internal diameter 4.6 mm Length 150 mm The food additives found in the sample resulted in the following data: ( see image for table) a.Calculate the number of plates from each peak. b.Calculate the plate height for the column. c.Retention factor for each peak.
- A 0.500g sample is analyzed spectrophotometrically for manganese by dissolving it in acid and transferring to a 250 mL flask and diluting to volume. Three aliquots ae analyzed by transferring 50 mL portions with a pipet to 500 mL Erlenmeyer flask and reacting with an oxidizing agent, potassium peroxydisulfate, to convert the manganese to permanganate. After reaction, these are quantitatively transferred to 250 mL volumetric flasks, diluted to volume and measured spectrophotometrically. By comparison with standards, the average concentration of the final solution is determined to be 1.25 x 10^-5M. What is the percent manganese in the sample?A 0.0200 gram blood sample was decomposed by a microwave digestion technique followed by dilution to 100.0 mL in a volumetric flask. Aliquots of the sample solution were treated with a lead complexing reagent and water as follows: Solution 1: 10.0 ml blood sample + 20.0 mL complexing agent + 30.0 mL H20. Solution 2: 10.0 ml blood sample + 20.0 mL complexing agent + 26.0 mL H20 + 4.00 mL of 78 ppb Pb2+ standard. The resulting solutions were analyzed by UV/Vis at 375 nm. Absorbance for solution 1 = 0.155 and for solution 2 = 0.216. Calculate the concentration of lead (ppb) in the original sample.The concentration of purified OXA-M290 is tested with a BCA assay. Serial dilutions of a bovine serum albumin (BSA) stock solution are prepared, then pipetted into a 96-well plate; each dilution of the BSA standard is tested in triplicate. Then, bicinchoninic acid and Cu2+ ions are added to all of the wells of the plate. After incubating the plate for 1 hour, a microplate reader is used to measure the absorbance of all of the wells in the plate at 560 nm. This generates the following data: BSA conc. (μg/mL), Replicate 1 Absorbance, Replicate 2 Absorbance, Replicate 3 Absorbance 40, 1.360, 1.403, 1.481 20, 0.750, 0.745, 0.810 10, 0.380, 0.344, 0.398 5, 0.198, 0.160, 0.183 2.5, 0.090, 0.100, 0.085 1.25, 0.038, 0.043, 0.051 0.625, 0.024, 0.028, 0.019 Prepare a calibration curve using these data. You can use Excel, R, SPSS or an equivalent graphing software. In this graph, plot absorbance (y-axis) against the concentration of the protein standard (x-axis). Calculate and plot…
- Chemistry The levels of an organic pollutant (P) in the groundwater at the perimeter of a plant were a cause for concern. A 10 mL sample of the water was taken and the pollutant was extracted with 95% efficiency using 25 mL of diethyl ether. GC was used to analyse the concentration of P in diethyl ether. A calibration curve was plotted for a series of standards of P which yielded the following results: Peak Area Toluene Conc. (µg/ml) 12,000 2.6 23,700 5.0 35,500 7.7 46,800 9.9 31,250 Sample Determine the concentration of P in ppb in the initial groundwater sample.6. The concentration of caffeine in an energy soft drink was determined by standard addition using HPLC. The following procedure was used: a standard caffeine solution was prepared by adding 0.09850g of caffeine to 25.0 cm3 of water.A series of solutions were prepared by adding known volumes of the standard solution to the soft drink before diluting to 100 cm3. The volume of standard and the caffeine peak area are shown in the table: Energy Drink (cm3) Added caffeine Std (cm3) Peak area 15 0 965 15 5 1352 15 10 1739 15 15 2126 15 20 2513 Determine the concentration of caffeine in the soft drink as mg cm-3. A. 3.3 B. 2.3 C. 4.3 D. 7.3A volume of 250 ml of a 0.05 M solution of a reagent of formula weight (relative molecular mass) 40 was made up, the weighing being done by difference. The standard deviation of each weighing was 0.0001 g. 1 (a) What were the standard deviation and relative standard deviation of the weight of reagent used?
- A 5.00 (±0.01) mL5.00 (±0.01) mL Class A transfer pipet is used to transfer 5.00 mL5.00 mL of a 0.253 (±0.003) M0.253 (±0.003) M Cu2+Cu2+ stock solution to a 100.00 (±0.08)100.00 (±0.08) Class A volumetric flask. Deionized water is used to bring the flask to volume. Calculate the concentration of the diluted soluion in the volumetric flask and report its absolute uncertainty.A spectrophotometric method for the quantitative determination of the concentration ofPb2+ in blood yields an Ssamp of 0.133 for a 1 mL sample of blood that has been diluted to 6 mL. A second sample is spiked with 1 µL of a 1467 ppb Pb2+ standard and diluted to 6 mL, yielding an Sspike of 0.491. Determine the concentration of Pb2+ in the original sample of blood.In a chromatography experiment, a solution containing 0.083 7 M X and 0.066 6 M S gave peak areas of AX = 423 and AS 5 347. (Areas are measured in arbitrary units by the instrument.) To analyze the unknown, 10.0 mL of 0.146 M S were added to 10.0 mL of unknown, and the mixture was diluted to 25.0 mL in a volumetric flask. This mixture gave the chromatogram in Figure 5-8, with peak areas AX = 553 and AS = 582. Find the concentration of X in the unknown.