Can you go over the question step by step or why one of the concentration is X by 0.5 one do part a 24-29. The equilibrium constant for the reaction2CrO- + 2H*= Cr,0,²- + H,Ois 4.2 × 1014. The molar absorptivities for the twoprincipal species in a solution of K,CrO7 areA, nmɛ, (CrO,²¯)E2 (Cr,0,²-)10.7 × 10²7.28 × 10²1.89 X 10²3451.84 X 104.81 × 10³1.88 X 103370400Four solutions were prepared by dissolving 4.00 ×10-4, 3.00 X 10-4, 2.00 × 10-4, and 1.00 × 10¬4moles of K,Cr,O, in water and diluting to 1.00 L with apH 5.60 buffer. Calculate theoretical absorbance values(1.00-cm cells) for each solution and plot the data for(a) 345 nm; (b) 370 nm; and (c) 400 nm.

The equilibrium constant for the reaction 2CrO,- + 2H* = Cr,0,²- + H,O is 4.2 × 1014. The molar absorptivities for the two principal species in a solution of K,CrO, are A, nm E, (CrO,²-) E2 (Cr,O,²-) 1.84 X 10³ 4.81 × 103 1.88 × 103 10.7 × 10² 7.28 × 10² 1.89 X 10² 345 370 400 Four solutions were prepared by dissolving 4.00 × 10-4, 3.00 × 10-4, 2.00 × 10-4, and 1.00 × 10¬4 moles of K,Cr,O, in water and diluting to 1.00 L with a pH 5.60 buffer. Calculate theoretical absorbance values (1.00-cm cells) for each solution and plot the data for (a) 345 nm; (b) 370 nm; and (c) 400 nm.

The equilibrium constant for the reaction 2CrO,- + 2H* = Cr,0,²- + H,O is 4.2 × 1014. The molar absorptivities for the two principal species in a solution of K,CrO, are A, nm E, (CrO,²-) E2 (Cr,O,²-) 1.84 X 10³ 4.81 × 103 1.88 × 103 10.7 × 10² 7.28 × 10² 1.89 X 10² 345 370 400 Four solutions were prepared by dissolving 4.00 × 10-4, 3.00 × 10-4, 2.00 × 10-4, and 1.00 × 10¬4 moles of K,Cr,O, in water and diluting to 1.00 L with a pH 5.60 buffer. Calculate theoretical absorbance values (1.00-cm cells) for each solution and plot the data for (a) 345 nm; (b) 370 nm; and (c) 400 nm.

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter31: Introduction To Analytical Separations

Section: Chapter Questions

Problem 31.18QAP

See similar textbooks

Similar questions

A 25.0 cm portion of 0.200, mol dm^-3 sodium ethanedioate solution was warmed and titrated against a solution of potassium manganate(VII). If 17.2 cm^3 of potassium manganate(VII) are required, what is its concentration?
The calibration curve y=0.0218x - 0.0001 for Fe2+ in buffer at 450 nm in a 0.5 cm cuvette. Is Beer's Law obeyed? Explain. and What is the molar extinction coefficient for the Fe2+ complex at 450 nm?
A 0.6025 g sample was dissolved and the Ca2+ and Ba2+ ions present were precipitated as BaC2O4.H2O and CaC2O4.H2O. The oxalates were then heated in a thermogravimetric apparatus leaving a residue that weighed 0.5713 g in the range 320oC to 400oC and 0.4674 g in the range 580oC to 620oC. Calculate the percentage Ba in the sample.
5 A biochemist wants to separate Glu, Arg, and His using a cation-exchange chromatograpy. Determine the order of elution from this column using pH=7.00 buffer mobile phase.
10-mL aliquots of an environmental water sample were pipetted into five 50.00-mL volumetric flasks. Exactly 0.00, 5.00, 10.00, 15.00, and 20.00-mL of a standard solution containing 11.1 ppm Fe3+ were added to each, followed by an excess of thiocyanate ion to give the red complex Fe(SCN)2+. After dilution to volume, the instrumental response for each of the five solutions measured with a colorimeter was found to be 0.240, 0.437, 0.621, 0.809, 1.809, respectively. Using Excel and the LINEST function, what was the concentration in the water sample (including error)? [HINT: consider the type of calibration scheme used.]
Using activity coefficients, find the concentration of Hg22+ in equilibrium with 0.10 M NaCl saturated with Hg2Cl2. (KSP of Hg2Cl2=1.2x10-18)
will addition of 300ml 0.005M agno3 to 200ml of 0.004M Al2(SO4)3 result in oreciptation of Ag2SO4 if Ksp of Ag2SO4 is 6.65x10^8?
Extraction of DNA involves the use of a 1 M phosphate buffer (1-liter volume) having the hydrogen ion concentration of 6.165950019 x 10-9 M. Three pKa of phosphoric acid are available Concentrated phosphoric acid (85% w/w; Sp. Gr. = 1.70; MW = 98 g/mol) Sodium dihydrogen phosphate monohydrate (MW = 138g/mol) Sodium biphosphate heptahydrate (MW = 268g/mol) Tribasic sodium phosphate monohydrate (MW = 182 g/mol) Sodium hydroxide pellets (40 grams/mol) Question: What is the pH of the solution? (answer in two decimal places) How much of the weak acid component should be used? (Note for answer: Round to the nearest hundredth and include the unit such as "grams or milliliters"; Ex. 100.00 grams or 100.00g for weight & 100.00 milliliters or 100.00 mL for volume) Question: What is the suitable buffer component to be used? (Note for the answer: Separate the two components with “and”; Ex: Ammonia and Ammonium chloride) Question: How much of the salt component should be used?…
A 0.4020 g sample was dissolved, and Ca2+ and Ba2+ ions present were precipitated as Ba.C2O4.H2O and CaC2O4H2O. The Oxalates were then heated in a thermogravimetric apparatus leaving a residue that weighed 0.3175 g in the range of 320°C to 440°C and 0.2165 g in the range of 580°C to 620°C. Calculate percentage Ca and percentage Ba in the sample.
1. IOn selective electrode utilizing pCO2 is used fro the measurement of the electrolyte a. Phoisphate b. bicarbonate c. Magnesium d. chloride e. sodium 2. The confirmatory method for the measurement of Calcium and Magnesium A. Turbidimetry b. FES c. none d. colorimtery e. AAS 3. the electrolyte is found as component of phospholipids, nucleic acids, creative phosphate and ATP a. magnesium b. calcium c. phosphate d. bicarbonate e. chloride
Forming Ba(I03)2, 500 mL of 0.5000 M Ba(NO3)2 was mixed with 500 mL of 0.0500 M NaIO3. Ksp=1.57x10^-9 What is the concentration of the excess reagent? What is the molar solubility of Ba(IO3)2 in this solution?
Micellar electrokinetic capillary chromatography was conducted at pH 10 with anionic micelles and the anode on the sample side. (i) Is aminobenzene (C6H5NH2) a cation, an anion, or a neutral molecule in this experiment? (ii) Explain how to decide which compound, aminobenzene or anthracene, is more soluble in the micelles.