G. Complex formation constants are influenced by solution pH and other ligands present in the solution. For EDTA-metal ion systems, the relationship between the formation constant (KMY) and conditional formation constant (K'MY) can be expresses as if pH is a solely factor for consideration.
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- A. This is the equilibrium constant for the reactionin which a solid salt dissolves to give its constituent ions in Chemicalequilibrium constant Solubilityproduct constant Idealgas constant Noneof these B. Directprecipitimetry: Van’tHoff Method VolhardMethod MohrMethod Gay-LussacMethod C. Molecules which provide a group ofattachments used in Maskingagents Demaskingagents Ligands Chelatingagents D. Substances that determine the concentrationof a metal in the presence of another metal Maskingagents Demaskingagents Ligands Chelatingagents E. EDTAis an example of a: Masking agent Demaskingagent Ligand Chelatingagent For numbersF to H, identify the component of the chemical reaction: PO4-3 + H3O+ → HPO4-2 + H2O. Select from the following choices: Acid Base Conjugateacid Conjugatebase F. PO4-3 G. HPO4-2 H. H2O For numbers I to L, consider the given chemical equation: NH3(aq) + H2O(l) ↔ NH4+(aq) + OH-(aq) I Thechemical reaction from the given…i) Silver ion (Ag+) reacts with SCN- ion to form silver thiocyanate (AgSCN). What change will the student observe when a solution containing Ag+ ion is added to the mixture? ii) Briefly explain how your answer to is consistent with Le Chatelier’s principle.The red color of soil is often due to the presence of iron. Metal ions are extracted from soil by stirring the soil in acid and then filtering the solution. One method for the analysis of Fe2+ is to form the highly colored Fe2+–thioglycolic acid complex. The complex absorbs strongly at 535 nm. Calibration standards of 1.00, 2.00, 3.00, 4.00, and 5.00 ppm are prepared by transferring appropriate amounts of a 10.0 ppm working solution of Fe2+ into separate 50-mL volumetric flasks, each of which contains 5 mL of thioglycolic acid, 2 mL of 20% w/v ammonium citrate, and 5 mL of 0.22 M NH3. After diluting to volume and mixing, the absorbances of the standards are measured. a)What is the effect on the reported concentration of iron in the sample if there is a trace impurity of Fe2+in the ammonium citrate?
- The red color of soil is often due to the presence of iron. Metal ions are extracted from soil by stirring the soil in acid and then filtering the solution. One method for the analysis of Fe2+ is to form the highly colored Fe2+–thioglycolic acid complex. The complex absorbs strongly at 535 nm. Calibration standards of 1.00, 2.00, 3.00, 4.00, and 5.00 ppm are prepared by transferring appropriate amounts of a 10.0 ppm working solution of Fe2+ into separate 50-mL volumetric flasks, each of which contains 5 mL of thioglycolic acid, 2 mL of 20% w/v ammonium citrate, and 5 mL of 0.22 M NH3. After diluting to volume and mixing, the absorbances of the standards are measured. a)Use the data table below to prepare a calibration curve (absorbance versus concentration in ppm). Fit the data to straight line and find the equation for the straight line and the R2 value. (Hint: Think about what to do with the absorbance of the blank.)Nickel bis-dimethylglyoximate complex was deposited with a weight of (4.869g) with the filter paper from the base medium from adding (10ml) of hot DMG to a salt of nickel chloride at weight (0.78g), find the percentage of nickel ion. Note that the weight of the filter paper (1.30g). At.Wt.: Ni= 58.69 g/mol, C= 12 g/mol, O=16 g/mol, H=1 g/mol, N=14 g/molShortly after the dissolution of lead(IV) oxide, the dissolvedPb4+ will react with water to form dissolved speciesand according to the following stoichiometric equation andchemical equilibrium coefficients. This will continue pullingPbO2(s) into solution, causing higher overall leadconcentrations
- Ag+ + ligand L --> Ag_ligandL_Complex K_bind = ??? The virtual lab below contains a 1.00M flask of 'Ligand L' along with a bottle of solid silver chloride. Perform an experiment in the virtual lab to determine the binding constant for this ligand (K_bind for the above reaction). ou will need to use your knowldedge of solubility to determine tthe binding constant. The Ksp for Silver Chloride is: 1.830e-10. Agcl 0.971351 What is the binding constant for this ligand (Please use three significant figures for your answer)Nickel bis-dimethylglyoximate complex was deposited with a weight of (2.721g) with the filter paper from the base medium from adding (10ml) of hot DMG to a salt of nickel chloride at weight (0.4g), find the percentage of nickel ion. Note that the weight of the filter paper (0.78g).How is the stability of a co-ordination compound in solution decided ?How is the dissociation constant of a complex defined?
- Q: The concentration of the sulphate ion in a mineral water can be determinedby the turbidity which results from the addition of excess BaCl2, to a quantityof measured sample. A turbidometer used for this analysis has been standardisedwith a series of standard solutions of NaSO4. The following resultswere obtained:Standard solution Conc. (SO4)2− (mg/L) Reading of turbidometerS0 0.00 0.06S1 5.00 1.48S2 10.00 2.28S3 15.00 3.98S4 20.00 4.61i. In supposing that a linear relationship exists between the readings takenfrom the apparatus and the sulphur ion concentration, derive an equationrelating readings of the turbidometer and sulphate concentration(method of least squares).ii. Calculate the concentration of sulphate in a sample of mineral waterfor which the turbidometer gives a reading of 3.67.(i) You have been provided with a sample collected from a water pool beside a slag heap at the iron ore mine. 35 uL of the sample is added to 1165 uL of buffered ferrozine (excess). If the %T recorded at 562 nm in a 2 mm cuvette is found to be 25%, calculate the concentration of Fe(II) in the sample in mol L−1 and ppm. Comment on the contamination level. (ii) Comment on a possible contaminant that could interfere with the assay and suggest an approach that could be used to account for its presence.Aqueous solution of PbCl2 at 20°C is saturated when 7.2 g of this compound are dissolved in 1 L of solution. a) Calculate the activity coefficients of Pb2+ ions, Cl- ions. Use Extended Debye-Hückel equation. For aqueous solution, parameter A=0.52, B=0.33. Ion size parameter for Pb2+ is 4.5 Å. b) Calculate the activities of Pb2+ ions and Cl- ions in the saturated solution.