CH204 Lab 4.docx - CH204 Inorganic Chemistry Lab Report...

  • No School
  • AA 1
  • 6

This preview shows page 1 - 4 out of 6 pages.

CH204 Inorganic Chemistry Lab Report Name: Nilesh Kumar ID: S11162698 Group: Thursday (8am-12pm)
Image of page 1

Subscribe to view the full document.

Experiment 4 : Preparation & Analysis of Chromium Oxalate Complexes Aim: This lab practical exercise aims to produce Cr3+ (aq) in this synthesis by reducing the readily available dichromate species with oxalic acid, followed by the addition of oxalate ion to produce the complex Introduction: The chemistry of Cr(III) is almost the chemistry of coordinate and chelate compounds of which thousands of compounds are known. Because of the kinetic inertness of Cr(III) complexes in aqueous solutions, many complex species can be isolated, because they persist in solution even where some of them are thermodynamically unstable. [ CITATION Bak12 \l 1033 ] The oxalato groups of the [Cr(ox)2(H2O)2] - complex are normally resistant against substitution or dissociation. Kallen et al. have reported about the reaction of the (glycinato-N,O)bis(oxalato) chromate(III) complex ion with oxalic acid to be initiated by a rapid amine terminus aquation of the glycinato-N,O ligand in hydrogen ion dependent and hydrogen ion independent pathways and ultimately produces an equilibrium mixture of the cisdiaquobis(oxalato)chromate(III) ion and the tris(oxalato)chromate(III) ion.[ CITATION Bak12 \l 1033 ] Methodology: The following reagents were used and procedures were followed: Reagents used: oxalic acid dihydrate potassium dichromate potassium oxalate ethanol 10% solution of KOH standard KMnO4 conc. H 2 SO 4 KBrO 3 ammonium sulphate 1M HCl conc. HCl KI
Image of page 2
standard thiosulphate solution Preparation of Potassium trioxalatochromate (III): Procedure: All glassware was thoroughly rinsed with distilled water before using. To avoid contamination of the chemicals inside the stock bottle, the chemicals were first poured out into a beaker and then used. To a solution of 4.600g of oxalic acid dihydrate (H 2
Image of page 3

Subscribe to view the full document.

Image of page 4
  • Fall '19

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Ask Expert Tutors You can ask 0 bonus questions You can ask 0 questions (0 expire soon) You can ask 0 questions (will expire )
Answers in as fast as 15 minutes