14 September 2009
Lab give notice (of) 3
Introduction
The purpose of this project is to identify an alien organic caustic (X) by conducting various experiments to determine the acid’s incomparable properties. By determining selected constant properties of the unknown and then analyze these properties to the constant properties of known nerves, it is possible to identify an unknown substance. The properties employ to identify the unknown must be intensive, or individual of amount. Both chemical properties and physical properties are intensive properties utilize in determining the identity of an unknown (Maserton, p. 15).
Because even itsy-bitsy amounts of impurities systematically affect observed chemical reactions, the first graduation to determine the identity of an unknown is to purify the substance. One proficiency often used to purify solids is re-crystallization from a selected solvent. Because of the variable solubility of different compounds in various solvents and at various temperatures, it is possible to remove impurities by dissolving the unknown and then like a shot cooling the solvent. The unknown re-crystallizes, but the impurities remain dissolved in the solvent.
It is then a relatively simple matter to drivel the pure crystals out of the impure solvent (Lab Manual, p. 32). Once the unknown has been purified, it is possible to begin determining its constant properties. One specialized physical property that is helpful in identifying an unknown is the substance’s melting point (Lab Manual, p. 36). Equivalent weight, the weight in grams of the acid that contains exactly one mole acidic henry’s, is also useful when identifying an unknown acid. Equivalent weight is laid by the pairing the unknown’s acidic hydrogen’s (H+) with known quantities of hydroxyl ions (OH-) through the process of titration. out front beginning a titration of the unknown acid, several practice titrations of...If you fate to get a full essay, order it on our website: Orderessay
If you want to get a full essay, wisit our page: write my essay .
No comments:
Post a Comment