What conditions must be followed to perform complexometric titration? A. presence of a catalyst B. low temperature C. [metal-EDTA] complex should be more stable than [metal-indicator] complex D. always add an EDTA solution to the analyzed solution and not vice versa
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What conditions must be followed to perform complexometric titration?
A. presence of a catalyst
B. low temperature
C. [metal-EDTA] complex should be more stable than [metal-indicator] complex
D. always add an EDTA solution to the analyzed solution and not vice versa
Step by step
Solved in 2 steps with 2 images
- b. EDTA cannot be used as a primary standard always. When can EDTA be used as a primarystandard ? Give reason why EDTA is used in complexometric titrations.Complex Ion Formation and Precipitation Reactions i. A 1-L water sample was submitted for determination of chloride ion. 100.00mL the sample was analyzed using the Volhard method. 50.00 mL of 0.0929N AgNO3 was added to the sample and was back titrated with 12.50mL of 0.0510N KSCN solution to reach the end point. Find ppm Cl- in the water sample. ii. Using Mohr method, the chloride content of a mineral water was determined. 50.00mL of the sample was titrated with 10.80mL of 0.05N AgNO3 solution to reach end point. Determine the concentration of Cl- in ppm. iii. Calculate the hardness of a water sample such that 100.00mL of the sample required 35.00mL of 0.1051M EDTA solution to reach the end point.In complexation volumetry, classify the statements below as true or false.Justify the one(s) that you judge to be “false”.a) When preparing an EDTA solution, to be used as a titrant of Ca2+ ions, it is necessary to add a small amount of Mg2+ in the solution.b) A metallochromic (Ind) indicator is a substance that forms colored complexes with metallic ions. The colors of these complexes are always the same as the colors of the free forms of these indicators.c) In order for the titration of a metal (Me) with EDTA to be carried out, it is necessary that the Me-EDTA complex has a stability constant greater than that of the Me-Ind complex.d) In determining the partial hardness of a hard water sample with EDTA solution, murexide is used as an indicator at pH 10.
- Which of the following causes the sharpest change in the equivalence point of a complexometric titration? A. Increasing the concentration of the EDTA solution B. Decreased concentration of the analyte C. Increasing the concentration of the EDTA solution D. Increasing the stability of the [metal-EDTA] complexElaborate the reason why EDTA is used in many complexometric titrations. How will you be able to improve its selectivity when it comes to analyzing specific metals?A small amount of Mg-EDTA is often added in the titrimetric determination of water hardness. Why? A. Mg forms the most stable EDTA complex of all multivalent cations. B. It ensures that enough Mg ions are present for satisfactory indicator action. C. Mg-EDTA is inert and therefore does not influence the results, but it enhances indicator action.D. The Mg-EDTA dissociates after all the other cations have been titrated and therefore ensures that the end point is clearly visible.
- what is the purpose of introducing ammonim sulphate to the mixture when determing the formula of a complex ion using colorimetric methodAn auxiliary competing agent is used in EDTA titrations to slow down the titration. keep some interfering component of the analyte mixture from complexing with the EDTA. speed up the titration. keep the metal ion from precipitating out of the solution.Select all statements that state the purpose of an auxiliary complexing agent and example of its use. a) A completing agent forms a weak complex with analyte ion, thereby keeping it in solution without interfering with EDTA titration. b) NH3 keeps Zn2+ in solution at high pH, but is easily displaced by EDTA. c) A completing agent forms a strong complex with analyte ion, thereby keeping it in solution without interfering with EDTA titration. d) NH3 keeps Zn2+ in solution at high pH, but is not displaced by EDTA.
- TRUE OR FALSE: Because of chelate effect, the formation reaction of the complex tris(ethylenediamine)cobalt(III) has a smaller negative ΔGrxn and a larger positive ΔSrxn compared to the formation of hexaamminecobalt(III).The Cr metal was dissolved in HCl. The pH was suitably adjusted by adding ammnoniaammonium buffer solution and 15.00 mL of 0.01768 M EDTA were introduced. The excess reagent required a 4.30-mL back-titration with 0.008120 M Cu2+. Calculate mass of Cr metal.Scott test is one of the methods used for screening for Cocaine in Forensic Chemistry. The multi step method consists of a) reacting the sample drug with cobaltous thiocyanate b) dissolving of the formed precipitate by adding HCl and c) extraction of coordination compound with Chloroform d) measurement of absorbance of extracted coordination compound at 627 nm What reaction occurs when HCl is added to dissolve the precipitate ? a.Lewis acid- Lewis base reaction b.Lewis acid- Bronsted Lowry base reactionc.Bronsted Lowry acid – Bronsted Lowry base reaction d.Arrhenius acid – Arrhenius base reaction