A Cu2+ solution obtained by dissolving a 3.1871-g penny in 500 mL of nitric acid has an absorbance of 0.342 at 620 nm in a 1.00 cm cell. The calibration curve prepared from Cu2* solutions of varying concentrations has a slope of 281.8 L/mol and a y-intercept of 0.0106. (a) Calculate the concentration of the solution in moles per liter. (b) Calculate the percent Cu by mass in the penny
Q: In the determination of iron in fortified cereals by atomic absorption, 0.9133 g of sample was…
A: A question based on absorption that is to be accomplished.
Q: Suppose you start with a 175 mL solution. After adding 2 mL of titrant, you spectrophotometer…
A: The concentration of the unknown solution indicates the amount of the unknown substance that exists…
Q: Differentiate acidimetry from alkalimetry
A:
Q: To prepare a standard solution of Mn2+, a 0.250 g sample of Mn is dissolved in 10 mL of concentrated…
A: Given : 0.25 g = Mn = 250 mg 10 ml = HNO3 and the solution transferred to 100 ml of volumetric…
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: A certain mixture of gasoline obtained from a petroleum refinery plant was found to contain only…
A: Given , Mass of sample = 0.4582 g
Q: A student wanted to determine the level of lead in amoxicillin powder, so he transferred 148 mg of…
A: Given the absorbance of the diluted solution, Y = 0.48 Calibration equation is: Y = 12.25X - 0.05…
Q: Barium sulfate from a 1.300-g sample was contaminated with 9.4 mg of Fe2(SO4)3 and weighed a total…
A: Solution - According to the question - Given - Molar weight of BaSO4 = 233.38 g/mol Mass of sample =…
Q: 4) How many mmoles of SCN ion are there in 1.0 mL of 0.00200 M KSCN?
A: Recall the following expression of milimoles(mmoles) as follows Milimoles=Volumein…
Q: A never circulated 1975 penny with a mass of 3.00 g was dissolved in concentrated nitric acid, the…
A: Absorbance is plotted on y-axis and concentration is plotted on x-axis. Mass of penny dissolved in…
Q: A certain mixture of gasoline obtained from a petroleum refinery plant was found to contain only…
A: Given : Mass of the mixtures burned = 0.4582 g Mass of CO2 produced = 1.0702 g And mass of PbO…
Q: The absorbance of a solution containing 5.0 x 10^-3 g/L of a solute in a 1.00 m cell is 1.00.…
A: 5.0 × 10-3 g/L of a solute solution in a 1.00 m cell has an absorbance of 1.00 . The molecular…
Q: The most abundant type of mammalian antibody circulating in the blood stream is IgG. A solution…
A:
Q: With reference to the following calibration curve, what is the concentration (M) of a solution with…
A: Absorbance v/s concentration graph plot helps to find the concentration of solution of unknown…
Q: In the acetic acid determination in vinegar experiment; NaOH was standardized with 0.25 g KHP (molar…
A:
Q: Which of the following could be useful for determining the chemical formula for pentaerythritol…
A: Pentaerythritol tetranitrate (PETN) = C5H8N4O12 1. PETN is a nitrate ester of pentaerythritol 2.…
Q: Calculate the molar absorptivity of a 1.00 x 10-4 M solution, which has an absorbance of 0.372, when…
A: The question is based on Beer's law. the formula for Beer's law is as follows: A=eLc here,…
Q: A calibration curve constructed from absorbance values of solutions containing a known concentration…
A: Given that : The best-fit line for the calibration curve constructed from absorbance values of…
Q: 1. A student synthesized 3.214g of Ni(NH3),Cl2 from 4.023g of NiCl2 6H₂O. He dissolved 0.81g of…
A: To find out the concentration of Ni2+ and the mass percent of nickel in the product.
Q: A certain mixture of gasoline obtained from a petroleum refinery plant was found to contain only…
A: Answer of 'd' is explained below. Here, we have to calculate only % (w/w) Pb from the given data.…
Q: Concentration (M) Absorbance 0.0200 0.102 0.0400 0.204 0.0600 0.306 0.0800 0.408 0.100 0.510 An…
A: As per Lambert-Beer's law, absorbance of a solution is directly proportional to concentration of…
Q: In the acetic ačid determination in vinegar experiment; NaOH was standardized with 0.35 g KHP (molar…
A: In this question, we want to determine the Molarity of NaOH You can see details Solution below step…
Q: The amount of ascorbic acid in cashew juice of different brands was determined by two different…
A: Colorimetry and titrometry are two different analytical technique to determine an unknown…
Q: 625 nm, which can be used for the spectrophotometric determination of ammonia. ocr -OH • NH,…
A: Soln
Q: Commercial Vanadyl Sulfate (VOSO4) is contaminated with H2SO4 and H2O. A solution was prepared…
A: Given parameters are, Wieght of VOSO4 = 0.2447 g Volume of solution = 50.00 mL Molarity of VO2+ =…
Q: A 0. 6875 g rock sample containing an unknown amount of Ca was dissolved in HCl and diluted to…
A: According to Beer-Lamberts law, the absorbance of a solution is directly proportional to its…
Q: a] An analyst would like to analyze the concentration of Mg2+ in a solution. He needs a calibration…
A: A question based on absorption that is to be accomplished.
Q: Differentiate between qualitative analysis and quantitive analysis?
A: The overall articulation Qualitative Analysis alludes to examinations in which substances are…
Q: > EL session.masteringchemistry.com MasteringChemistry ROSTER-2019-SPRI-PULLM-CHEM-101 blackboard…
A: When a solution is diluted, the expression that relates the concentration and volume of the original…
Q: If you have a sample of 42.6 mg/L of calcium and 7.2 mg/L of magnesium, what concentration does the…
A: A numerical problem based on complexometric analysis, which is to be accomplished.
Q: Explain why the concentration of zinc cannot be determined directly using a spectrophotometer.
A: The atomic no of zimnc is 30. It contain many free electrons
Q: The pH of a solution is 5.30 + 0.01. What is the concentration of H* in the solution and its…
A: Given data is as follows: The pH of the solution =5.30±0.01 As we know that; pH=-logH+ The hydronium…
Q: If a second brass washer of 0.6003 grams had been dissolved in nitric acid, diluted to 50.00 mL and…
A: Solution
Q: Determine the molecular mass and nominal mass of phenol, C¸H,OH.
A: Molecular mass is the sum of molar masses of all elements constituting a molecule. Nominal mass is…
Q: The hardness of water is analyzed using titration. A liter of water sample from tap water found to…
A:
Q: 1. From spinach, the chromatographic analysis will yield two major substances: (a) B-carotene…
A: (i). Characteristics of beta-carotene: β-carotene is the molecule that gives carrots, sweet…
Q: Five white, 500-mg uncoated ascorbic acid (AA) tablets with an average weight of 0.6152-g were…
A:
Q: 2- In a soil with Da = 1.30 g/cm3 at a depth of 15 cm, an absorbance value of 0.80 was obtained…
A:
Q: What is the absorbance of a theoretical compound in a 5.26x10-5 M solution, a path length of 1.5cm,…
A: The absorbance, A, of a theoretical compound in the given solution is calculated as shown in…
Q: Using the equation for the calibration curve below calculate the concentration of a CUSO4 solution…
A: Given , the equation of graph .
Q: A 0.100 mol dm 3 aqueous solution of nickel(II) salt shows three absorbances, one of which has a…
A:
Q: Based on your extinction coefficient, if a 0.8211 M solution of copper(II) nitrate is diluted by…
A: Absorbance is measure of capacity of a substance to absorb the light of specified wavelength .…
Q: The iron content of a municipal water supply was determined by an atomic absorption procedure. The…
A:
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: A spectrophotometric method for the quantitative analysis of Pb2+ in blood has a normal calibration…
A: Given that the normal calibration equation is Sstd = (0.296 ppb-1) Cstd+0.003.
Q: To determine the molar concentration of a metal ion in a solution of unknown concentration, a…
A: The graphical equation given is : y = 5.747 x + 0.013 absorbance of the final diluted solution =…
Q: 10. The concentration of haemoglobin in a blood sample was determined by spectrophotometry. A…
A: Given Absorbance concentration 0.069 1 0.113 2 0.201 4 0.377 8 0.730 16
Trending now
This is a popular solution!
Step by step
Solved in 3 steps
- A chemist obtained the following data for percent lindane in the triplicate analysis of an insecticide preparation: 7.23, 6.95, and 7.53%. Calculate the 90% confidence interval for the mean of the the three data, assuming that (a) the only information about the precision of the method is the precision for the three data. (b) on the basis of long experience with the method, it is believed that s---->σ lindane. (c) If s=0.28 is good estimate of σ, how many replicate measurement should be made in order for the mean for the analysis of sample to be within 0.2% of the true mean 90% of the time.(d) 3-13. Distis me Jum 4 A method of analysis yields weights for gold that are low by 0.4 mg. Calculate the caused by this uncertainty if the weight of gold in the sample is (a) 900 mg. (c) 150 mg. 1-7. The method described in Problem 3-6 is to be used for the analysis of ores that assay about 1.2% gold. What minimum sample weight should be taken if the relative error resulting from a 0.4-mg loss is not to exceed -0.2%? percent relative error (a) (b) (b) 600 mg. (d) 30 mg. 3-14. Wha stan stam 3-15. Сог mea (b) -0.5%? (a) -0.8%? (c) (d) 1.2%? 3.5 3-8. The color change of a chemical indicator requires an overtitration of 0.04 mL. Calculate the percent relative error if the total volume of titrant is (a) 50.00 mL. (c) 25.0 mL. 3-9. A loss of 0.4 mg of Zn occurs in the course of an analysis to determine that element. Calculate the per- cent relative error due to this loss if the weight of Zn in the sample is (a) 40 mg. (c) 400 mg. 3.1 3.1 (b) 10.0 mL. 3.3 2.5 (d) 40.0 mL. Fo (a (E (b) 175…5. (1) (ii) Ibuprofen (206.3 g/mol) absorbs at 255 nm and shows a molar absorptivity of 3010 L/mol.cm. A tablet of ibuprofen, 0.6654 g, was ground and 0.2203 g powder was dissolved in 20% methanol in a 100 mL volumetric flask (Solution A). Exactly 5.0 mL of Solution A was diluted in a 50.0 mL flask and the resulting solution showed an absorbance of 0.1228 AU in a 1.00 cm cell. (i) What is the concentration (mol/L) of ibuprofen in the 100 mL stock solution? (ii) Report the amount of ibuprofen in mg/Tablet. Ibuprofen H3C | HCCH; 1 H3C CH3 -CH-COOH
- Five white, 500-mg uncoated ascorbic acid (AA) tablets with an average weight of 0.6152-g were pulverized in a mortar. A sample of the powdered ascorbic acid weighing 0.4700-g was placed in an iodine flask and was dissolved in 50-mL H2SO4 then 5-g of KBr was added to the resulting solution. The solution was titrated with 47.81-mL of 0.09640 N STD. KBrO3 to reach a faint yellow endpoint then 3-g KI and 5-mL Starch TS. The blue color solution is then titrated with 2.73-mL of 0.09123 N STD. Na2S2O3 to reach the disappearance of the blue iodostarch complex. MW: KBrO3 = 167.0 ; KIO3 = 214.0 ; Na2S2O3 = 158.11 ; C6H8O6 = 176.12 Compute the milligrams of pure AA per tablet from the assay. 293.3 mg 502.5 mg None of the choices 383.9 mgFive white, 500-mg uncoated ascorbic acid (AA) tablets with an average weight of 0.6100-g were pulverized in a mortar. A sample of the powdered ascorbic acid weighing 0.4610-g was placed in an iodine flask and was dissolved in 50-mL H2SO4 then 5-g of KBr was added to the resulting solution. The solution was titrated with 46.73-mL of 0.0152 M STD. KBrO3 to reach a faint yellow endpoint then 3-g KI and 5-mL Starch TS. The blue color solution is then titrated with 2.78-mL of 0.1047 M STD. Na2S2O3 to reach the disappearance of the blue iodostarch complex. MW: KBrO3 = 167.0 ; KIO3 = 214.0 ; Na2S2O3 = 158.11 ; C6H8O6 = 176.12 Compute the milligrams of pure AA per tablet from the assay. None of the choices 349.7 mg 264.3 mg 462.7 mgA student prepared four standard solutions of (NH4)2Fe(SO4)2 and measured their absorbance at 505 nm. She created a calibration plot with the best-fit line of y = 9372 x + 0.0539. She measured the absorbance of her diluted unknown sample solution as (4.69x10^-1) nm. If she prepared her diluted sample solution by diluting 10.00 mL of the original solution to a total volume of 50.00 mL with deionized water, what is the concentration of Fe2+ in her original solution? Answer in units of M. Note: Your answer is assumed to be reduced to the highest power possible.
- You were assigned to assay a product sample of milk of magnesia. A 0.600-g sample was reacted with 25.00 mL 0.10590 N H2SO4 . The excess unreacted acid in the solution required 13.00 mL of 0.09500 N NaOH when titrated to reach the methyl red end point. Determine the dosage strength of the product in terms of % Mg(OH)2 content. Type your answer in 2 decimal places, numbers only.Blue Blue dye stock solution 0.293 M Absorbance at 630 nm 0.00265 Calibration curve y = 0.0833x A solution is prepared by diluting 2.81 mL of the blue dye stock solution to 25.00 mL. The measure absorbance for the prepared solution is listed in the data table. (a) What is the theoretical molar concentration? [Blue]theoretical | × 10 |M (b) What is the experimental molar concentration? [Bluelexperimental x 10 M (c) What is the percent error? Percent error (blue) =Nitrite ion, NO2-, is a preservative for bacon and other foods, but it is potentially carcinogenic. A spectrophotometric determination of NO2- makes use of the following reactions: A 5.00 cm cell was used to measure absorbance. Here is an abbreviated procedure for the determination. 1. To 50.0 mL of unknown solution containing nitrite is added 1.00 mL of sulfanilic acid solution. 2. After 10 min, 2.00 mL of 1-aminonapthalene solution and 1.00 mL of buffer are added. 3. After 15 min, the absorbance is read at 520 nm in a 5.00-cm cell. The following solutions were annaylzed: A. 50.0 mL of food extract known to contain no nitrite(that is a neglible amount); final absorbance =0.153 B. 50.0 mL of food extract suspected of containg nitrite ; final absorbance= 0.622 C. Same as B, but with 10 microliters of 7.50x10^-3 M NaNO2 added to the 50.0 mL sample; final absorbance= 0.967 a) Calculate the molar absorptivity of the colored product. Remember that a 5.00 cm cell was used b) How many…
- Fe+3 (aq) + SCN – (aq) FeSCN +2 (aq) She mixes 4.00 mL of 2.00 mM SCN– and 5.00 mL of 2.00 mM Fe+3 ions, then diluting with 1.00mL of water to give a total volume of 10.00mL. She measures the absorbance of the solution asbeing 0.210. If she has previously calculated the molar absorbtivity constant (ε) of the product tobe 2583 cm–1 M–1, what is her best estimate for the K value for this reaction?Ine density Calculate the molarity of solution prepared by weighing 6.34 g of NaOH using a balance with a standard deviation of ± 0.05 g and dissolving it in a 500 mL of water in a volumetric flask with a standard deviation of ± 0.2 mL.In the determination of iron in fortified cereals by atomic absorption, 0.9133 g of sample was weighed. After a previous treatment, it was dissolved and diluted to 100 mL, an aliquot of 25.0 mL was taken, this was diluted to 100 mL and this solution presented an absorbance reading of 0.251. A series of iron standards of the following concentrations were prepared: 0.0; 1.0; 2.0; 2.5 and 3.0 ppm. Whose absorbances were 0.0; 0.241; 0.405; 0.520 and 0.640. Determine the iron concentration in mg/100 g of sample.