Calculate pCd²+ at each of the given points in the titration of 50.00 mL of 0.0080 M Cd²+ with 0.0080 M EDTA in the presence of the auxiliary complexing agent NH3. The solution is buffered at a pH of 11.00 and the NH3 concentration is fixed at 0.100 M. The fraction of EDTA in the form Y4 as a function of pH can be found in this table. The formation constant for the Cd²+-EDTA complex can be found in this table. The cumulative formation constants for the Cd(NH3)2+ complexes can be found in this table. 0 mL 45.00 mL 55.00 mL pCd²+ pCd²+ pCd²+ = 11.00 mL 50.00 mL pCd²+ = = pCd²+ =

Calculate pCd²+ at each of the given points in the titration of 50.00 mL of 0.0080 M Cd²+ with 0.0080 M EDTA in the presence of the auxiliary complexing agent NH3. The solution is buffered at a pH of 11.00 and the NH3 concentration is fixed at 0.100 M. The fraction of EDTA in the form Y4 as a function of pH can be found in this table. The formation constant for the Cd²+-EDTA complex can be found in this table. The cumulative formation constants for the Cd(NH3)2+ complexes can be found in this table. 0 mL 45.00 mL 55.00 mL pCd²+ pCd²+ pCd²+ = 11.00 mL 50.00 mL pCd²+ = = pCd²+ =

Chemistry & Chemical Reactivity

10th Edition

ISBN:9781337399074

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter17: Principles Of Chemical Reactivity: Other Aspects Of Aqueous Equilibria

Section17.6: Equilibria Involving Complex Ions

Problem 1.2ACP: What is the minimum volume of 0.0071 M NaCN(aq) necessary to dissolve the gold from 1.0 metric ton...

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(ii) Consider the titration of 25.00 mL of 0.02000 M CaSO4 with 0.01000 M EDTA at pH 10.00. Write the chemical equation for this titration and calculate the conditional formation constant for this reaction. (iii) From (ii) calculate the concentration of Ca2+ and pCa2+ at the volume of 20.0 mL of EDTA added.
A 50.0ml sample of water containing both Ca+2 and Mg+2 is titrated with 16.54ml of 0.01104M EDTA in an ammonia buffer of pH 10. Another 50.0ml sample is treated with NaOH to precipitate the Mg(OH)2 and then titrated at pH 13 with 9.26ml of the same EDTA solution. Calculate the ppm each of CaCO3 and MgCO3 in the sample.
A 25.00 ml of Ni2+ solution was diluted in HCl and treated with 25.00 ml of 0.05283 MNa2EDTA. The solution was neutralized with NaOH followed by addition of acetate buffer untilthe pH 5.5. The solution turns yellow after addition of few drops of xylenol orange indicator.Back titration using standard 0.022 MZn2+ at pH 5.5 requires 17.61 ml until end point, onwhich the solution will turn red. Calculate for the molarity of the unknown.
Chromel is an alloy composed of nickel, iron and chromium.A 0.6472 g sample was dissolved and diluted to 250 mL. When a50 mL aliquot of 0.05182 M EDTA was mixed with an equal volumeof the diluted sample and all the three ions were chelated, a 5.11 mLback titration with 0.06241 M copper (II) was required.The chromium in a second 50 mL aliquot was masked through theaddition of hexamethylenetetramine, titration of the Fe and Nirequired 36.28 mL of 0.05182 M EDTA.Iron and chromium were masked with pyrophosphate in a third50 mL aliquot and the nickel was titrated with 25.91 mL of theEDTA solution.Calculate the percentage of nickel, chromium and iron in thealloy.
17. Which of the following statements is not true? (a) EDTA is a hexaprotic acid containing four carboxyl protons and two ammonium protons. (b) EDTA forms 1:1 complexes with most metal ions. (c) The concentration of a free metal ion can be determined through titration with EDTA. (d) If the pH of a metal-EDTA complex solution is fixed by a buffer, the conditional formation constant (K,) can be determined. (e) The formation constant, K, for an EDTA complex is typically a small value.
Sometimes it is not possible to indicate the end point of a titration.a) How can one proceed then and what is the name of the type of titration that can be performed? Briefly describe. An example in which this method can be used is in the determination of mercury, which forms strong complexes with EDTA, but for which there is no suitable indicator that can indicate the end point. b) You are given the task of determining the Hg2 + concentration in a sample solution? After adding an excess of EDTA, the sample solution is titrated with a magnesium solution. 20.00 ml of a 0.0452 M EDTA solution was added to 30.00 ml of sample solutionThe excess EDTA was determined by adding 0.0500 M Mg 2+ solution, consuming 4.37 ml to the end point.
Calculate the molar solubility of calcium oxalate in a solution that has been buffered so that its pH is constant and equal to 4.00. Data: Kps of CaC2O4 = 1.7x10 -9 ; Ka1 of H2C2O4 = 5.60x10-2 and Ka2 = 5.42x10-5 . Use systematic treatment.
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.
A particular buffer has been made up at 25 °C to give a pH of 8.00 and is then warmed to 35 °C. The pH of the solution changes because the pKa of the acid used to make the buffer has changed. What is the pH of the buffer solution at this new temperature if it is known that the pKa of the acid at 25 °C is 8.14 and ΔpKa/ ΔT = -0.018 °C-1?
Calculate pCd²+ at each of the given points in the titration of 60.00 mL of 0.0060 M Cd²+ with 0.0060 M EDTA in the presence of the auxiliary complexing agent NH,. The solution is buffered at a pH of 11.00 and the NH, concentration is fixed at 0.100 M. The fraction of EDTA in the form Y as a function of pH can be found in this table. The formation constant for the Cd²+ -EDTA complex can be found in this table. The cumulative formation constants for the Cd(NH,)2+ complexes can be found in this table. 0 mL. pCd²+ = 17.00 ml pCd²+ 55.00 mL 60.00 ml. pCd²+ = 65.00 ml. pCd²+ = pCd²+ = = [1
What is the molar solubility of Ag2CO3 in an aqueous solution that is buffered to a pH of 2.37? Relevant constants: Ksp for Ag2CO3 = 8.1 x 10-12; K1 H2CO3 = 4.45x10-7; K2 for HCO3- = 4.69x10-11; Kw = 1.00x10-14.
Chromel is an alloy composed of nickel, iron and chromium. A 0.6553-g sample was dissolved and diluted to 250.0 mL. When a 50.00-mL aliquot of 0.05173 M EDTA was mixed with an equal volume of the diluted sample, all three ions were chelated, and a 5.34-mL back titration with 0.06139 M copper (II) was required.The chromium in a second 50.0-mL aliquot was masked through the addition of hexamethylenetetramine; titration of the Fe and Ni required 36.98 mL of 0.05173M EDTA. Iron and chromium were masked with pyrophosphate in a third 50.00-mL aliquot, and the nickel was titrated with 24.53 mL of the EDTA solution. Calculate the percentage of Cr in the alloy. Express your answer in 2 decimal places.