There are several types of titrations: Acid-base titrations are based on the neutralization reaction between the analyte and an acidic or basic titrant. Redox titrations are based on an oxidation-reduction reaction between the analyte and titrant. Complexometric titrations are based on the formation of a complex between the analyte and the titrant. Ex: the chelating agent EDTA is very commonly used to
Double Replacement Reactions & Table F When two substances undergo a chemical reaction, new substances are formed. A double replacement reaction is one type of reaction that can form soluble or insoluble products. The purpose of the lab was to figure out how the solubility of a substance (aqueous or precipitate) can be determined when a double replacement reaction happens. Precipitates are insoluble compounds. A precipitate is a solid product that comes out of solution in a chemical reaction.
Introduction In Chemistry 1211 lab the main objective was to identify the name of the unknown acid #2651145-PLF13 that was issued by the instructor. Melting point, titration of the unknown acid, calculation of equivalent weight, pKa, solubility tests, and properties of a hydrochloric acid; these procedures were used to characterize the unknown acid and then compared with known substances using GSU Chemistry department search engine. By doing this experiment he or she will develop an understanding of the properties of organic acids and differences between properties of a strong acid such hydrochloric acid. Experimental The first procedure to identify the unknown organic acid was finding the correct melting point. This was done by taking small amounts of the unknown acid.
Objectives: The purpose of this lab is to observe the reaction of crystal violet and sodium hydroxide by looking at the relationship between concentration and time elapsed of the crystal violet. CV+ + OH- CVOH To quantitatively observe this reaction of crystal violet, the rate law is used. The rate law tells us that the rate is equal to a rate constant (k) multiplied by the concentration of crystal violet to the power of its reaction order ([CV+]p) and the concentration of hydroxide to the power of its reaction order ([OH-]q). Rate = k[CV+]p[OH-]q To fully understand the rate law, concentrations of the substances must be looked at first. The concentration is measured in molarity.
The change in enthalpy relies on the concentration of the salt solution, because different concentrations will produce different enthalpies. There is an equation to determine how much of this heat energy is lost or gained when a reaction is performed. Q = c m (T1-T2) Where: q is the energy in Joules C is the heat capacity, measured in joules per gram per degree Celsius M is the mass of the solution, measured in grams J is the joules G is the grams of water T is the temperature ΔH=ΔE + PΔV = (q p +w) – w = q p Procedure: 1. Follow instructions 1-9 in Appendix A-1 to initialize the MeasureNet workstation. a.
Chemical environment surrounding the carbons are different and therefore affecting the character of the hydrogens attached. This difference in chemical environment finally explains the different interaction between hydrogen and chlorine. Determination of percent yield, and relative reactivity data was processed after the products of the reaction were analyzed using Gas Chromatography. Percent yield was calculated for each isomer and determined to be; 5.94% for 1,1-dichlorobutane, 23.1% for 1,2-dichlorobutane, 47.1% for 1,3-dichlorobutane, and 23.9% for 1,4-dichlorobutane. The relative reactivity of the hydrogens H1, H2, H3 , and H4 were 0.37, 1.4, 2.9, and 1.0 respectively.
Finding the Ratio of Moles of Reactants in a Chemical Reaction I. Purpose The purpose of the lab is to be able to find the ratio of mole reactants in the chemical reaction. The lab uses the method of continuous variations in order to determine the mole ration of two reactants. The chemicals that were used in the lab where sodium hypochlorite (NaClO), and sodium thiosulfate (Na2S2O3). II.
The reason why we're determining if their was a chemical reaction is to identify if it is exothermic or endothermic. How exactly we do is that ionic compounds dissolve in water ,or HCl, to break down the ionic bonds. With these ions it attaches to the water molecules and
The bromine is acting first like an electrophile, and then after bromine has broken the π bond, a carbocation has formed, and a bromide ion has been created, the bromide ion then acts as the nucleophile and forms a bond with the carbocation. This experiment uses bromination, the specific name of halogenation with bromine. In order to for bromination to occur bromine must first be generated. This is done in situ through the oxidation of glacid acetic acid and puridinum bromide perbromide. Once generation is accomplished the available bromine can be brominated.
This is why there have been a variety of techniques that chemists have used over the years to analyze the presence of halides in various substances1. The first of the three techniques used in the experiment is volumetric titration technique, which is further subdivided into two visual techniques of analysis, the Mohr method and the Fajan method. Volumetric titration uses rudimentary titration methods to determine halide concentration. The two methods of volumetric titration differ in their use of indicators to show the equivalence point. The Fajan method is named after American physical chemist Kazimierz Fajans and a dichloroflourescein indicator is used to indicate the equivalence point.