Possible cation/s present (can be one or more): Cu2+, Ca2+, Fe3+, NH4+, Zn2+ Provide a flowchart (containing added reagents + possible ions) and/or a brief explanation.
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Given the reagents and given observations, deduce the possible anions and cations present in the unknown sample.
CATION ELIMINATION TEST OBSERVATIONS
| Reagents | Observations |
|
NaOH |
Light blue ppt |
|
Excess NaOH |
Partial dissolution of ppt |
|
NH3 |
Light blue ppt |
|
Excess NH3 |
Deep blue complex |
Possible cation/s present (can be one or more): Cu2+, Ca2+, Fe3+, NH4+, Zn2+
Provide a flowchart (containing added reagents + possible ions) and/or a brief explanation.
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- Cation Elimination Test ObservationsAdded Reagents and their ObservationsNaOH = Light blue pptExcess NaOH = undissolved pptNH3 = Blue pptExcess NH3 = Dissolved precipitation ; deep blue complex1. What are the possible Cation/s present?Cu2+ , Zn2+ , Ca2+ , Fe3+ , NH4+ Cation Confirmatory test ObservationsAdded Reagents and Observation:Excess NH3 = Dissolved precipitation ; deep blue complexKSCN = NVRK4Fe(CN)6 = NVRK4Fe(CN)6 = NVRNa2C2O4 = White precipitationNaOH (in evap dish) = NVR2. what are the possible ion/s present? Show a flowchart.Cu2+ , Zn2+ , Ca2+ , Fe3+ , NH4+EDTA abstracts bismuth(III) from its thiourea complex:Bi1tu2631 1 H2Y22 S BiY2 1 6tu 1 2H1where tu is the thiourea molecule (NH2)2CS. Predict the shape of a photometric titration curve based on thisprocess, given that the Bi(III) or thiourea complex is the only species in the system that absorbs light at 465nm, the wavelength selected for the analysis.Aluminium (III) reacts with the Chelating agent HL to give a complex AlL3 that is readily soluble in CHCl3. A spectrophotometric study shows that when a 1.77 x10-4 M aqueous solution of aluminium was extracted with CHCl3 containing 0.01M HL, the analytical concentration of aluminium at pH 4.5 in the two phases were 1.5 x 10-4 M [Al3+]upper) and 2.73 x10-5 M ([AlL3]lower) . What is the distribution coefficient at pH 4.8.
- Provide a flowchart (containing added reagents + possible ions) and/or a brief explanation. CATION CONFIRMATORY TESTS ADDED REAGENT(S) OBSERVATIONS KSCN Blood red complex K4Fe(CN)6 Prussian blue ppt K3Fe(CN)6 NVR Na2C2O4 NVR NaOH (in evaporating dish) NVR ANION CONFIRMATORY TESTS ADDED REAGENT(S) OBSERVATIONS (to the ppt) CH3COOH NVR MgCl2 NVR 6M H2SO4, FeSO4, 18M H2SO4 Brown ring POSSIBLE ION(S) PRESENT? Select one or more: Fe3+ SO42- I- Zn2+ Cu2+ PO43- Ca2+ CO32- SCN- Br- NO3- NH4+A Chem 17.1 student was asked to determine the anions present in an unknown solution. The following observations were obtained from his analysis: XYZ +6.0M H₂SO4 +0.10 M BaCl₂ 43,00M HOẶC white ppt X white ppt dissolves without effervescence +0.10 M AgNO, yellow ppt Y yellow ppt Yellow ppt dissolves +6.00 M. NH: +conc NH₂ no reaction (ion Z)water sample is determined through a spectrophotometric method based on the reaction of phosphate ion with molybdate ion, by originating a yellow complex. Calibration standards (P1 to P5) are prepared as follows: different volumes of a 102.2 mgL1 phosphate solution are added to several 100 mL volumetric 1. The content of phosphate in a flasks. Then, 10 mL of diluted HCI, 10 mL of 1% molybdate ion solution, and 10 mL of 0.75% oxalic acid solution are added to every flask, and finally water is added up to the volumetric mark. Samples are prepared in the same way, adding different sample volumes instead of phosphate standard solution. Absorbance of all solutions is measured at 360 nm, and the following data are obtained: Added volume Absorbance at 360 nm P1 2a 0.109 P2 5a 0.249 P3 10a 0.501 P4 15a 0.748 Р5 20a 1.008 Blank 0.000 Sample 20b 0.624 (a) mL of 102.2 mg L' phosphate standard solution. (b) mL of sample Calculate the concentration of phosphate in the water sample expressed in mg…
- Pt (II) and TI (III) are two metals that can be determined by UV spectrophotometry with Metromeprazine (C19H24N2S2). The PtM complex has a max at 545 nm and the TIM complex at a max of 621 nm. To 25 ml of the sample with excess of reagent M, they were diluted to 50 ml with the appropriate solvent. Calculate the concentration of Tl in the test sample with the following data. ɛ (M' cm) 545 nm ɛ (M cm) 621 nm PtM 6.29 E4 1.15 E3 TIM 3.55 E2 5.64 E4 Absorbance b = 1 cm 0.595 0.518 Notes Molecular weight of Pt= 195.078 g/mol Molecular weight of Ti = 47.90 g/mol The molecular weight of Metromeprazine= 344.14 g/mol Оа. 1.250E-03м O b. 2.48E-04 M О с. 1.80E-05 М O d. 7.124E-07 M O e. 1.150E-03 Mс C Get Homework He XC | Chegg.com /CHE%203701_2022_TL_101_2022_0_b.pdf 4 a) F7 Question 3 (1) (ii) b) N 1 19/21 - 100% + @ propeny, o donation of it acceptance dominates in this complex! TOVIC explanation of your reasoning. a) P3 & 7 (iii) Question 4 (iv) F8 Which of the following complexes would be stable or unstable? Explain your answer (i) [Fe(CO)3] (ii) [Fe(CO)6] [Fe(NO)s] (iii) (iv) [Fe(CO)2(NO)2] U J Draw the structure of [Co(CO)2(NO)(cot)] where cot is cyclooctatriene. What is the coordination number of the Co ion? What is the hapticity of the cot ligand? Briefly describe the bonding between Co and cot. W Draw the structure of the following antimalarial complexes: (1) Chloroquine Ferroquine F9 8 K F10 A ( 9 F11 X L ) (6 O F12 Help us protect yc x structure c P 1 { + 11 DO Insert PrntScr Delete } 1 O Backspace Enter Desktop Pgu Nu1. Question: Pd (1I), Au (III) methiomeprazine (C19 H24 N2S2) with the complex. A mixture of their complexesis being analyzed. Pd (II) complex at 480 nm, The measurement results for Au (III) with max peak at 635 nm are as follows. of the mixture What is the concentration?(b=1) Pd(II) Au(III) Mixture 480 nm 3,55x103 2,96x103 0,533 635 nm 5,641x0³ 1,45x10 0,590
- Which of the following statements is false regarding the use of HCI in the UV-Vis experiment? Addition of HCI prevents the formation of hydroxo complexes O b. Not adding HCl decreases the amount of Fe3+ available for complexation Addition of HCI prevents the formation of hydroxide precipitates O d. Both A & B O e. None of the AboveChromium (III) ion was complexed with EDTA and determined via back-titration. Given the following data, compute for %CrCl3(MM=158.35) in a 2.63 g sample. Conc. of EDTA titrant: 0.0103 MVolume used: 5.00 mLConc. of Zn2+ back titrant: 0.0112 MVolume used: 1.32 mLWhich of the following will cause no change in the amount of Fe calculated from the results of an iron-phenanthroline analysis? A No added hydroxylamine B Using a pH 10 buffer All of the given choices will cause a change in the calculated Fe content of the sample D Using 0.5% w/v 1,10-phenanthroline instead of 0.1% w/v.
