Fe3+Y4 FeY- Kf = 1.0 x1025 Cu2+Y CUY²- K₁ = 6.3 x1018 and the further information that, among the several reactants and products, only CuY²- absorbs at 750 nm, describe how Cu(II) could be used as indicator for the photometric titration of Fe(III) with H2Y². Reaction: Fe³+ + H2Y2 →FеY¯ + 2H
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- A standard solution was put through appropriate dilu tions to give the concentrations of iron shown in the ac companying table. The iron(II)-1,10,phenanthroline complex was then formed in 25.0-ml aliquots of these solutions, following which each was diluted to 50.0 mL (see color plate 15). The absorbances in the table (1.00-cm cells) were recorded at 510 nm Fe(II) Concentration in Original Solution, ppm Aşie 4.00 0.160 0.390 10.0 16.0 0.630 24.0 0.950 32.0 1.260 40.0 1.580 (a) Plot a calibration curve from these data. (b) Use the method of least squares to find an equa tion relatin g absorbance and the concentration of iron(II). (c) Calculate the standard deviation of the slope and intercept.4) Jitanium(IV) and vanadium(V) form çolored complexes when treated with bydrogen peroxide in 1 M şulturic acid, The titanium complex has an absorption maximum at 415 nm, and the vanadium complex has an absorption maximum at 455 nm. A 1.00x10-3 M şolution of the titanium complex exibits an absorbance of 0.805 at 415 nm and of 0.465 at 455 nm, while a 1.00x10-2 M şolution of the vanadium complex exibits absorbances of 0.400 and 0.600 at 415 and 455 pm. respectively. A 1.0 g sample of an alloy containing titanium and vanadium was dissolved, treated with excess hydrogen peroxide, and diluted to a final volume of 100 mb. The absorbance of the solution was 0.8 at 415 nm and 0.6 at 455 nm. What were the percentages of titanium and vanadium in the alloy?2
- 2.) Phosphorus in urine can be determined by treating with molybdenum(VI) and then reducing the phosphomolybdate with aminonaphthol sulfonic acid to give the characteristic molybdenum blue color. This absorbs at 690 nm. A patient excreted 1270mL urine in 24 h, and the pH of the urine was 6.5. A 1.00-ml aliquot of the urine was treated with molybdate reagent and aminonaphthol sulfonic acid and was diluted to a volume of 50.0 ml. A series of phosphate standards was similarly treated. The absorbance of the solutions at 690 nm, measured against a blank, were as follows: Solution Absorbance 1.00 ppm P 2.00 ppm P 0.205 0.410 3.00 ppm P 0.615 4.00 ppm P 0.820 Urine sample 0.625 (a) Calculate the number of grams of phosphorus excreted per day. (b) Calculate the phosphate concentration in the urine as millimoles per liter. (c) Calculate the ratio of HPO, to H,PO, in the sample: K= 1.1 x 10 K,= 7.5 x 10+ K,= 4.8 x 10-Three absorption bands were observed at 11200, 18350, 29000 cm-1 in the electronic spectrum of the [Ni(en)3]2+ complex. What is the ligand field transition corresponding to the absorption band at 18350 cm-1? (28Ni)7. Write defect equations for the following reactions: (a) MgO doped with Li₂O (b) Slight reduction of PrO₂ (c) TiO₂ doped with Ga₂03 (d) LaCoO3 doped with CaO (e) MgAl2O4 doped with V₂O3 to form Mg(Al2-xVx)204
- System 3: NaHSO3 and KMnO4 Do three variations: [3A], [3B] & [3C] [3A] Acidic solution In large test tube, 0.1 M NaHSO3 (2 mL) + 3 drops of 0.5 M H₂SO4; then add 10 drops of 0.1 M KMnO4, drop by drop. The sign of reaction will be the loss of the permanganate color. [3B] Slightly basic solution 0.1 M NaHSO3 (2 mL) + 2 drops 1 M NaOH; then add 0.1 M KMnO4 dropwise (about 10 drops). [3C] Strongly basic solution 0.1 M NaHSO3 (2 mL) + 1 mL 6 M NaOH; then add 0.1 M KMnO4 dropwise (about 10 drops). Note two reactions: the first, a color change, is unique to system [3C]; the second, a precipitate, is like that of [3B]. Please write balane redox reaction, hint HSO3- > HSO4-, H2SO4+MnO4-->MnSO4Synthesis of a nickel schiff base complex: nickel(II) acetate tetrahydrate + pyrrole-2-aldehyde was reacted with a solution of ethanol/water and refluxed at 65oC. 2M sodium hydroxide was added along with a solution of 1,3-diaminopropane in water. The solid formed was dissolved in dichloromethane and heptane was added to it. The dichloromethane was evaporated off and the product was vacuum filtered. What is the reaction mechanism for this reaction and what is the name of the end product formed?Vanadium has two isotopes (50V, 0.25%; 51V,99.75%). The EPR spectrum of an aqueous solutionof [VO(OH2)5]2+ shows an 8-line pattern, andg-values of gzz=1.932, gxx = 1.979 and gyy=1.979were determined. What can you deduce from the data?
- A nickel schiff base complex was formed following the synthesis below: nickel(II) acetate tetrahydrate + pyrrole-2-aldehyde was reacted with a solution of ethanol/water and refluxed at 65oC. 2M sodium hydroxide was added along with a solution of 1,3-diaminopropane in water. The solid formed was dissolved in dichloromethane and heptane was added to it. The dichloromethane was evaporated off and the product was vacuum filtered. What is the reaction mechanism for this reaction and what is the name of the end product formed? Draw the structure of the product formed.Consider the fictional transition metal 'Gc' and the complex ions formed with it: [GcI.], [Gc(NH;).]*+, and [Gc(C:O.).]>- If the A of max absorbance for one of the solutions is 450 nm, what are the possible colors for each of the solutions? (A) [GcI]³ could appear yellow, [Gc(NH;).]+ could appear purple, and [Gc(C,O.):]}- could appear blue. (B) [GcI.]- appears purple, [Gc(NH;).]+ could appear yellow, and [Gc(C.O.);]- could appear blue. (C) [GcI6]3- could appear purple, [Gc(NH3)6]3+ could appear yellow, and [Gc(C204)3]3- could appear orange. (D) [GcI6]3- could appear yellow, [Gc(NH3)6]3+ could appear purple, and [Gc(C204)3]3- could appear orange. (E) Not enough infoThe following reaction is the basis for automatized breath tests for the detection of alcohol(e.g. the Breathalyzer):C2H6O + Cr2O72- --> C2H4O2 + Cr3+ The Cr2O72- ions generate a reddish orange aqueous solution that changes to green as Cr3+ ions are produced due to the reaction with ethanol (C2H6O). a) Write the two half-reactions and identify which is a reduction reaction and which is an oxidation reaction.b) Balance this redox reaction in basic conditions.