Seawater was spiked with phosphate to achieve a quantifiable range of phosphate concentrations by the spectrophotometer. What components of the spectrophotometer or sample preparation could be changed that would improve detection limits
Q: An acetic acid solution at equilibrium is found to have H =6.3 x1012 M at 25°C, what is the pH of th...
A: pH of a solution can be calculated from the concentration of H+ ions.
Q: Types of volumetric analysis are. * O Three. O Five. O Four.
A: volumetric analysis : This method is also known as Titration.
Q: How many significant figures in a substance with a mass of 503.45?
A: No. of significant figures in a substance with a mass of 503.45?
Q: (c) Explain crystal field splitting in the case of tetrahedral complexes.
A: Crystal field splitting in tetrahedral complexes:
Q: Chlorine can be prepared in the laboratory by the reaction of manganese dioxide with hydrochloric ac...
A:
Q: What is the pH of a solution made by mixing 1.57E1 mL of 0.100 M NaOH(aq) with 50.0 mL of 0.100 M HC...
A:
Q: What is the change in volume for a system under a constant 2 atm pressure that releases 807 J of hea...
A: given :- heat released = 807 J constant pressure = 2 atm change in internal energy = -300.5 J 1 ...
Q: Time (min) Which separation is better? What can cause this behaviour (if all other conditions are th...
A: To explain which separation is better.
Q: 2. Explain how Lavoisier's Law of Conservation of Mass supports Democritus' theory that atoms cannot...
A: Please find your solution below : Atom is the smallest unit of matter. It is defined as the basic bu...
Q: PHYSICOCHEMICAL PROPERTIES OF METHYL SALICYLATE Appearance Litmus Test Result pH Value Viscos...
A: Physicochemical properties of a substance refer to the set of the properties that describe the physi...
Q: Calculate the pH of the following solutions. 0.20 M pyridine-3-carboxylic acid hydrochloride
A: pH of weak acid
Q: Table 3b.1. Observations on the metal paper clip or needle placed on the surface of distilled water ...
A: when we put tissue paper metal paper clip on it into the distilled water we found that paper clip ...
Q: hat is the product of the following reaction? H2 Pd /C No reaction OH
A:
Q: The free energy change for the following reaction at 25 °C, when [Sn2+] = 1.19 M and [Zn2+] = 7.83×1...
A:
Q: Seawater was spiked with phosphate to achieve a quantifiable range of phosphate concentrations by sp...
A: A question based on tools in analytical chemistry that is to be accomplished.
Q: If 29.11 mL of KMNO4 solution is required to oxidize 25.00 mL of 0.03105 M of Na2C204 solution, what...
A:
Q: In your own words, explain the relationship of wavelength and frequency.
A: Using Einstein's energy relation we can derive the relation between frequency and wavelength
Q: Calculate the mass of glucose (CH,206) that contains a billion (1.000 × 10°) hydrogen atoms. Be sure...
A:
Q: To make a buffer from a mixture of HF and NaF that has a pH = 3.35 what must the ratio of (F^-/HF) b...
A: a buffer of a weak acid and its conjugate base, HF and NaF. given, pH = 3.35 Ka = 7.2 x 10-4
Q: Ge As (1) The element with an electron configuration of 1s²2s²2p®3s²3p64s²3d5 is in group and period...
A: Identification of group and period:
Q: Ce Pr Nd Pm Sm Eu 6a Tb Dy Ho Er Tm vo Lu Th Pa u Np Pu Am Cm Bk Cr Es Ma No Lr Write the complete e...
A: Electronic configuration: The electronic configuration of an element describes how electrons are...
Q: How many grams of Na3PO4 required to prepare 8 N in 500 ml? O 218.6 gm. O 656 gm. O 323.6 gm.
A:
Q: b) Give detailed synthesis, properties and uses of Kevlar. c) How symmetry of repeating units in pol...
A:
Q: (c) How many stereoisomers are present in tartaric acid? Also draw their structures.
A:
Q: How many grams of Na3PO4 required to prepare 8 N in 500 ml? O 218.6 gm. O 656 gm. O 323.6 gm.
A:
Q: required components in an .electrochemical corrosion cell Two. O Four. Three.
A: As per bartleby guidelines I answered only first question so please don't mind.Thanks in advance.
Q: Reaction of 2-butanone with CH3MBBR/ether followed by H3O* gives a, 4° alcohol O 1° alcohol O 3° alc...
A:
Q: The Pauli Exclusion Principle tells us that no two electrons in an atom can have the same four quant...
A: This can be easily determined from basic knowledge. ml value lies from -l to +l,ms value is either +...
Q: Use the concept of hybridization to explain the shape of the C2 molecule. Your response should also ...
A:
Q: A D B.
A: When zn Reacts with HCl -->H2 gas is liberated . And with the help of Eudiometer,the volume of li...
Q: Which of the following molecules containing nitrogen and oxygen has identical empirical and molecula...
A: Please find your solution below : Molecular formula of a compound is a formula that shows the exact ...
Q: Why, the rates of reactions involving Co and Cr" be different from those involving other first-row t...
A: Co and Cr is first row transition metal but rate of reaction is different than other first row eleme...
Q: What necessary steps can you suggest to avoid impurities in final precipitate during gravimetric pre...
A: Answer and explanation is given below hope you like it.
Q: Try Again Your answer is incorrect. Solid aluminum (Al)and chlorine (Cl,) gas react to form solid al...
A:
Q: Determine the type of reaction shown below: Br Br2, H20
A:
Q: If the pKa of a weak acid HA is 3.84, what is the pkb of its conjugate base A-
A: Given Data : pKa = 3.84 To Find : pKb
Q: (Q102) Consider the production of hydrogen chlorine gas from its elements. H2 (g) + Cl2 (g) 2 HCI (...
A:
Q: An unknown compound has the following chemical formula: Fe(NO,), where x stands for a whole number. ...
A: Molecular formula: In a molecular formula we describe the number of atoms of all the elements presen...
Q: An environmental chemist analyzed the effluent (the released waste material) from an industrial proc...
A: Given : Volume of sample = 3.52 ml Volume of NaOH solution = 10.59 ml Concentration of NaOH solut...
Q: The amount of iron in ore can be quantitatively determined by titrating a solution of the unknown wi...
A: Given values -> Volume of iron(3) = 25.0ml (V1) Volume of dicromate =18.0ml (V2) Molarity of dicr...
Q: If you discover a mutant yeast whose glycolytic pathway was shorter because of the presence of a new...
A:
Q: Calculate the pH of the following solutions. 0.40 M phthalic acid
A:
Q: Gaseous ammonia chemically reacts with oxygen (0,) gas to produce nitrogen monoxide gas and water va...
A:
Q: What mass of AI, O, is produced when 19.0 L of O, gas react with Al at 506 K and 5.25 atm. 4 Al(s) +...
A:
Q: 2. Draw the optical isomers of CH3-CHOH-CHOH-CH3 . INDICATE the absolute configuration of each chira...
A: Optical isomers of butane 2,3 diol.
Q: (b) What do you mean by enzyme catalysis? Derive Michaelis-Menten's equation?
A:
Q: 2. Given CH4 (g) + C12 (g) --à CH3CI (g) +CHI (g). Ten grams of CH4 and 40.0g of chlorine gas underg...
A:
Q: Write the pressure equilibrium constant expression for this reaction. 2 CH;OH(1)+3 O,(9)→2 CO,(g)+4H...
A:
Q: how all work in your notebook, including dimensional c Combination/s 30z → 2 Fe2O3 a) How many moles...
A:
Q: Use the Henderson-Hasselbach equation to perform the following calculations. The K, of acetic acid i...
A: Molar mass of sodium acetate trihydrate = 136.08 g/mol
Seawater was spiked with phosphate to achieve a quantifiable range of phosphate concentrations by the spectrophotometer. What components of the spectrophotometer or sample preparation could be changed that would improve detection limits?
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
- Seawater was spiked with phosphate to achieve a quantifiable range of phosphate concentrations by spectroscopy. What components of the spectrophotometer or sample preparation could be changed that would improve detection limits?0.1120 g of a solid sample containing copper was dissolved by acid and transferred to a 250.00 mL volumetric flask and volume was made up with distilled water. The solution was then diluted by a factor of 25. The final solution was analyzed by atomic absorption spectrophotometry and the concentration was found be 2.982 ppm, What is the weight percentage of copper in the original solid sample? Keep four significant figures in your final answer.3. The lead in a swab sample, lead standards, together with a blank were made up in 5.00 mL volumetric flasks using 0.2 % HNO3. 20 μL aliquots of these solutions were injected into the spectrophotometer and the absorbance measured at 217 nm. The following results were obtained. lead / ppb Absorbance 0 0.0591 10.00 0.0858 50.00 0.1926 100.0 0.3260 150.0 0.4594 200.0 0.5929 Swab sample 0.3700 (a) Determine the amount of lead in the swab sample in μg.
- The determination of iron in wines was carried out by atomic absorption spectrophotometry, using the standard addition method. To do this, 10 mL of wine were placed in five 50 mL volumetric flasks; then 0, 5, 10, 15 and 20 mL of a 10 ppm iron standard solution were added to each of them. Next, they were gauged with distilled water and the absorbance was measured, obtaining the values of 0.040, 0.062, 0.081, 0.102 and 0.125 respectively. Calculate the regression parameters and obtain the iron concentration in the wine, in µg / mL.A sample solution containing quinine was analysed by fluorescence spectroscopy. 5 mL of the sample solution was diluted with 0.1 M HCl to a final volume of 100 mL. The fluorescence of the solution was measured and gave a value of 54. A reference solution containing 0.086 mg/mL of quinine gave a fluorescence reading of 38. A blank solution gave a fluorescence reading of 21. Calculate the quinine content of the sample solution in mg/mL.The ppm concentration of Pb2+ in a blood sample were measured with Spectrophotometry. 5.00 mL of a blood sample were taken and this sample gave a signal of 0.301 a.u.. Another 5.00 mL of a blood sample were mixed with 0.50 mL og 1.75 ppm Pb2+. Then, this mixture was diluted to 25.00 mL and this diluted mixture gave a signal of 0.406 a.u.. What is the ppm concentration of a blood sample?
- For the determination of Fe3 +, 25 mL of sample taken from sea water is diluted to 100 mL and a quantity of the obtained solution is taken and Fe3 + is determined by atomic absorption spectrophotometer. The absorbance values of the standard and sample solutions are below, and calculate the Fe3 + concentration in sea water in mg / L by drawing the relevant graph.Solution Absorbance1 mg / L Fe3 + 0.04095 mg / L Fe3 + 0.205110 mg / L Fe3 + 0.411615 mg / L Fe3 + 0.620820 mg / L Fe3 + 0.8222Sample Solution 0.5155Exactly 5.00 mL aliquots of a solution containing analyte X were transferred into 50.00-mL volumetric flasks and the pH of the solution is adjusted to 9.0. The following volumes of a standard solution containing 2.00 µg/mL of X were then added into each flask and the mixture was diluted to volume: 0.000, 0.500, 1.00, 1.50 and 2.00 mL. The fluorescence of each of these solutions was measured with a fluorometer, and the following values were obtained: 3.26, 4.80, 6.42, 8.02 and 9.56, respectively. ii. Using relevant functions in Excel, derive a least-squares equation for the data, and use the parameters of this equation to find the concentration of the phenobarbital in the unknown solution.A 10.00-g sample containing an analyte was transferred to a 250-mL volumetric flask and diluted to volume. When a 10.00-mL aliquot of the resulting solution was diluted to 25.00 mL it was found to give a signal of o.235 (arbitrary units). A second 10.00-mL aliquot was spiked with 10.00 mL of a 1.00- ppm standard solution of the analyte and diluted to 25.0o mL. The signal for the spiked sample was found to be o.502. Calculate the weight percent of analyte in the original sample.
- 5 What would the effect of increasing sample pressure (while maintaining a fixed cell length) have on an FTIR spectrum. By ”cell” I mean the chamber holding the gas.Quantitative Analysis by External Standard Method Calcium in a juice sample is determined by atomic absorption spectrophotometry. A stock solution of calcium is prepared by dissolving 1.834 g of CaCl, 2H20 in water and diluting to 1000.0 mL. A substock calcium solution was prepared by transferring 10.00 mL of the stock to a 100.00 mL volumetric flask and diluting to the mark. Three standard solutions of calcium were prepared by transferring 2.500 mL. 5.00 mL and 10.00 mL of substock to 50.00 mL volumetric flasks and diluting to the mark. The sample is prepared by transferring 1.000 mL of fruit juice from the original bottle to a 25.00 mL flask and diluting to the mark. Strontium chloride is added to all solutions before dilution to avoid phosphate interference. Instrumental response of the standards is measured against the blank, and the following readings are recorded: 9.10, 18.6 and 37.0. The sampie reading is 28.1. Using the multipoint method, find the concentration of calcium in…A student weighed out 0.150 g of protein powder and dissolved it in 100 mL of water (Solution 1). The student then diluted this solution by transferring 1 mL into a 25 mL flask and diluting with water (Solution 2). Finally, 1 mL of that solution was transferred to a test tube and combined with 4 mL Bradford reagent. The absorbance of the solution in the test tube was 0.235. Assuming that the best fit linear line of the standard curve was y = 0.04144 x + 0.01521 (μ g mL), calculate the percent protein by mass in the original protein powder