Complexometric Titration of Calcium Lab Report Example | Topics and Well Written Essays - 1000 words - 1

Complexometric Titration of Calcium - Lab Report Example In this experiment, the searchers are trying to perform a complex formation reaction for analytical purposes. The main aim of this titration reaction is to determine the presence of calcium ions in a titrant by a method referred to as titrimetric. The chemists use the common titrant referred to as ethylenediaminetetraacetic acid, (EDTA). This acid is commonly used in complex formation reactions because of its ability to form complexes with most metal ions because of its tetrabasic form. The EDTA acid molecule has a hexadentate ligand structure having four oxygen and two nitrogen molecules which donate atoms simultaneously. One major advantage of using EDTA as a chelating agent is because it forms a stable compound with most metals ions in a reacting ration of 1:1. Secondly, the reaction between EDTA and metal ions forms larger compound structures such that the reaction is product favored making it suitable for the reaction to proceed to full completion. These two major advantages mak e EDTA be the preferable titrant in most complex formation reactions. The purpose of this titration reaction is to determine the presence and concentration of calcium carbonate, (CaCO3) in an unknown solution sample. The known reagents in this reaction include the following: First, there is a known amount of Ammonia buffer solution. Secondly, there is Disodium EDTA dehydrate with an FW of 372.24. Thirdly, there is a calcium carbonate with an FW of 100.87 which is primary standard and dried for a period of about 2 hours at 100 0c.

Analyzing Othello Essay Example | Topics and Well Written Essays - 250 words

Analyzing Othello - Essay Example Lago was careful enough to burn the match on both ends. He had taken both Othello and Cassio into complete confidence. He knew Othello was aware of his real battle skills and earned Cassio’s sincerity by offering him handkerchief. Lago very carefully made Othello feel that Cassio had conducted adultery with Desdemona. In such circumstances, whatever Desdemona had to say in her defense would not matter. Lago’s strategy was too wisely constructed and carefully practiced for Othello to escape. Therefore, it is irrational to call Othello unjust in his display of haste and violence towards Desdemona. On the other hand, Othello also did not trust whatever Lago told him unless he had a solid proof for that. Othello had been very angry with Lago for having uttered humiliating and disdainful remarks about his wife when Lago accused Desdemona to have made love with Cassio. Othello’s rage can be estimated from the fact that he had warned Lago that he would kill him if he di d not provide Othello with a solid proof about Desdemona and Cassio’s relationship. When Lago remained successful in providing Othello with a solid proof of his assertion, Othello can not be blamed for not having suspected Lago instead of Cassio. Works cited: Shakespear, William. Othello, the moor of Venice: A tragedy. London: J. Tonson. 1743, Print.