Turel and Patil (1996)  have established a rapid and selective method for the extraction of molybdenum with malachite green into nitrobenzene. The influence of solvent extraction variables on molybdenum extraction such as effect of pH, time of equilibration, solvents, effect of various anions and cations have been studied. On the basis of substoichiometric extraction method the constituent ratio of the metal-organic complexes was found as 1:1. The slope ratio method was also in agreement with the
Introduction: In coordination compound ligands are Lewis bases - they contain at least one pair of electrons to donate to a metal atom/ion. Ligands are also called complexing agents. In coordination compounds metal atoms/ions are Lewis acids - they can accept pairs of electrons from Lewis bases. The atom that is directly attached to the metal atom/ion within ligand is called the donor atom. A coordinate covalent bond is a covalent bond in which one atom (i.e., the donor atom) shares the both electrons.
The Copper ions will react with Iodine ions to form CuI and I2 in a two-step reaction below: 2 Cu2+ (aq) + 2 I- (aq) 2 Cu- (aq) + I2 (s) ----1 2Cu+(aq) + 2I-(aq) CuI(s) CuI2 precipitate would decompose immediately to from CuI. Excess Na2S2O3 is added to react with Iodine to form I- ions which can be filtered out via suction filtration, the residue being CuI. I2(s) + 2 Na2S2O3 (aq) 2 NaI (aq) + Na2S4O6
2 drops of phenolphthalein is added to the solution by using dropper. The colour of the solution change to light red. 4. Burette is filled with sulphuric acid to titrate the solution with drop by drop while the conical flask is shaken slowly until the light red colour disappear. 5.
Promptly following the test, the aluminum foil boat discarded in the waste disposal, along with the three substances. The next method was a test of solubility in water. A new piece of wax, salt, and sugar were gathered and poured into separate 100 mL beakers, half-filled with sink water. The sugar was stirred with a glass stirrer, the salt was stirred with a wooden stirrer, and the wax was also stirred with a wooden stirrer. The substances reaction in the water was observed and the results were
Then get the Acetic acid and pour exactly 100mL of it into the graduated cylinder (This should almost fill it up). When that is completed repeat steps 1 and 2 four more times, which would mean five graduated cylinders of 100mL of Acetic acid. Part 3: Carrying out the reaction Wash the 250mL-beaker and dry it with paper towels. Add one of the 4.2 grams of catalyst (Sodium Hydrogen Carbonate) that has been obtained in step one into the beaker. Making sure that the beaker is dry before hand.
After that, the water sample was fixed using 2ml manganous sulfate and alkaline iodide. The bottle was shook then allow the brown precipitate to settled after all brown precipitate settled 2ml of sulfuric acid was added. The stopper was replaced then the bottle was shook again until all precipitate was completely dissolved. As the water
The XY1 type shows O···H interactions, which HOY acts as hydrogen bond donor (HBD). In the XY2 type, the O···H and X···Y interactions have been assigned between HOY and HC3OX molecules. In the H···O interaction HOY acts as HBD while in the X···Y it might act as electron acceptor (Lewis acid) or electron donor (Lewis base) regarding the nature of X and Y atoms. In the XY3 model a halogen bond (XB) interaction was found between HC3OX and HOY in which Y atom of HOY as electron acceptor interact with O atom of HC3OX as electron donor. It should be noted that no halogen bond was observed between HC3OX and HOF (FF3, ClF3, BrF3 and IF3).
This is an indication that the solution reached the equilibrium point and all the acid reacted with the base. So after the phenolthalein drops were added to the HCl in the conical flask that positioned under the burette. The conical flask was placed above white tile, to provide clearer environment to notice the change in the color of the solution. The reason of using conical flask instead of any another glassware is to prevent the solution from spilling out while swirling the mixture. Then amounts of NaOH were added to the HCl-indicator mixture, at the same time of adding NaOH the flask was shaken to assure that every thing mix up together.
An electrophile means an electron seeking species. Haloarenes will undergo the usual benzene ring reactions such as nitration, halogenation, Friedel-Crafts reactions and sulphonation. Before discussing all the electrophilic reactions, we need to understand the nature of Reaction of Haloarenes with respect to the attack of an electrophile. We know that haloarenes are electron-rich compounds. Therefore, they can undergo electrophilic substitution reaction and the attacking species, in this case, will be an electrophile.