A spectrophotometric method for the quantitative determination of the concentration of Pb2+ 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.

Q: A method for the analysis of Ca2+ in water suffers from an interference in the presence of Zn2+.…

A: Consider the concentration of Zn+2 = 1                The concentration of Ca+2 = 100  The given…

Q: You are asked to do quality control and quality assurance during the determination of lead…

A: The limit of quantitation is given by the expression: Limit of quantitation=10 sm     where,…

Q: 4- Titrimetric methods : are quantitative methods that are based on determining the mass of a pure…

A: This question is related to titrimetric methods where a solution of a known concentration is used to…

Q: A solution containing 2.30 mM of X (analyte) and 1.15 mM of S (standard) gave peak areas of 1728 and…

A: Given,   known Amount of X = 2.30 mM, amount of S = 1.15 mM  Peak area of X is 1728 and that of S is…

Q: The mass percent of Fe in an unknown salt sample was determined using both volumetric and gra…

A: We are given replicate values for the mass percent KHP for two different methods.  We can find…

Q: 23. An aqueous mixture of two substances are analysed by both paper chromatography and high…

A: Few questions based on general chemistry that are to be accomplished.

Q: A spectrophotometric method for the quantitative analysis of Fe2+ in blood uses Zn2+ as an internal…

A: Given, Zn2+ is the internal standard Fe2+final = 3.25 ppbZn2+final = 0.75 ppbSignal for Fe2+, SFe2+…

Q: A student researcher performed a chromatographic separation of caffeine and aspartame. The retention…

A: Retention time for caffeine (tc) = 200.8 sbaseline peak width for caffeine (wc) = 16.1 sRetention…

Q: The Kjedahl procedure was used to analyze 256 µL of a solution containing 37.9 mg protein/mL. The…

A: NH3 +  HCl = NH4Cl HCl + NaOH = H2O  +   NaCl Here, one mole of NH3 reacts with one of  HCl and also…

Q: A solution with 0.083 7 M X and 0.050 0 M S9 gave areas AX = 423 and AS9 = 372. Then 10.0 mL of 0.05…

A: Given: A solution having 0.0837 M X and 0.0500 M S’ showed peak areas AX = 423 and AS’ = 372,…

Q: Consider a separation performed on a 30.0 mm long open tubular column with a 0.50 mm diameter and a…

A: Length of column(L) = 30.0 mmDiameter of column(d) = 0.50 mmThickness(t) = 2.0 micrometerRetention…

Q: Exactly 6.00 ml of acetic acid (density = 1.05 g/mL), MW=60.05) was added to a 1-liter volumetric…

A: 6.00 mL of acetic acid was added to a 1 L flask and filled with distilled water . A conductance…

Q: Internal standard. Mn was used as an internal standard for measuring Fe by atomic absorption. A…

A: According to beer lamberts law A = Absorbance, K = constant C = concentration

Q: A new dye (DYE C) was developed and was analyzed against other dyes using paper chromatography. A…

A: TLC is an analytical technique which can be used to monitor the organic reaction transformations.…

Q: To determine the instrument detection limit of Pb2+ ions, a student made 10 blank solutions and…

A: Given: Standard deviation of the signal = 0.199 Equation of the curve =, y = 3.413x + b From here…

Q: A spectrophotometer method for the quantitative analysis of Pb2+ in blood uses Cu2+ as an internal…

A: given : SASIS = 0.8320.351= 2.37 CA = concentration of analyte = 1.75 CIS = concentration of…

Q: What is the resolution in ppm NO3-N of a spectrophotometer that gives a reading of 0.600 absorbance…

A: In this question, Absorbance of the given sample is given for particular Concentration and you want…

Q: A 20-mL solution of 0.0659 M AgNO3 was titrated with 20 mL of 0.0509 M NaCl (Ksp = 1.8x10-10).…

A: 20 mL of 0.0659 M AgNO3 solution was titrated with 20 mL of 0.0509 M NaCl solution .The Ksp is…

Q: A sample of water from a river was analyzed by titrating a 125 mL aliquot with 0.0210 M EDTA,…

A: EDTA reacts with Ca in 1:1 ratio to form CaEDTA complex. By using definite concentration of EDTA ,…

Q: For this experiment I prepared two solutions: each was an injection of 15 microliters of pure acetic…

A: 1 μL = 10-6 L 1 L = 1000 mL Volume of acetic anhydride (MW = 102.09 g/mol) taken in mL, V = 15.9 μL…

Q: for density is M/\ Calculate the molarity of solution prepared by weighing 6.34 g of NaOH using a…

A:

Q: A solution contains 0.10 M Sr(NO3)₂ and 0.20 M Bi(NO3)₂. When solid Na AsO is added to the solution…

A: The question is based on the concept of solubility product principle. It states that when a weak…

Q: A student used 500mg of tabletop sweetener to make a total of 5ml of solution with biuret reagent.…

A: The student prepared a solution containing 500 mg of tabletop sweetener in a total volume of 5 mL.…

Q: The thiourea in a 1.455 g sample of organic material was extracted into a dilute sulfuric acid…

A: In chemistry, there are many ways to check the deviation of experimental data from the accurate…

Q: 20 ml of 0.1 N Ammonia diluted to 60 ml with water. (kb = 1.8 x 10-5) pH = pKw –;pKb +logC What is…

A: First calculate the pKb using below the relation and substitute Kb is 1.8×10-6…

Q: A student researcher performed a chromatographic separation of caffeine and aspartame. The retention…

A:

Q: standardized by dissolving 0.5005g of CaCO3 (99.00% purity) in 100.0mL. A 10.00-mL aliquot was then…

A: Introduction :  Complexometric titration are used to determine the metal ions by use of complex…

Q: Determine the concentration of Pb2* in the sample of blood.

A:

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: percentage thiourea

A:

Q: An analyst determines the Ct content of rain water with ion chromatography. The data for the…

A: IntroductionAn analyst is using ion chromatography to determine the concentration of chloride ions…

Q: Water from Jordan Lake was analyzed for its Fe³+ content. A 20.0-mL sample of lake water was…

A: First, we have to calculate the value of the molar absorptivity constant, ε using the concentration…

Q: The answer is 0.372 ug/mL

A: Please see the attached image for the solution.  If there are queries or if the image is not…

Q: A student researcher performed a chromatographic separation of caffeine and aspartame. The retention…

A: Given tc = 209.6 sωc = 14.4 sta = 260.0 sωa = 21.2 sd = 22.1 s

Q: An acidic solute, HA, has a Ka of 1.00 X 10-5 and a partition coefficient, Kp, between water and…

A: Given, Ka=1.00 x 10-5 KD=5 pH=8 Vaqueous=50 mL Vorganic=100 mL To calculate, Extraction…

Q: Reagent Blank Absorbance Concentration of Stock Solution: 10 ppm Volume of Stock Solution (mL) Total…

A:

Q: Gas Chromatography (GC) is one of the useful techniques in analytical chemistry. Give two important…

A: It is one of the most convenient technique for the analysis and separation purposes of molecules in…

Q: A 0.1093-g sample of impure Na2CO3 was analyzed by the Volhard Method. After adding 50.00 mL of…

A: Answer: This question is based on stoichiometric calculation where we have convert the moles of…

Q: Tooth enamel is composed of the mineral hydroxyapatite, Ca5(PO4)3OH which has a Ksp of 6.8 x 10-37.…

A: Step 1: Step 2: Step 3: Step 4:

Mass Spectrometry

This process is an instrumental method in which a sample is changed to fast moving positive ions by electron bombardment. The charged particles vary due to their different mass to charge ratio and are estimated with the help of this difference. It is also called mass spectroscopy.