Category : Chemisty

LeChatelier’s Principle Buffers

By: Selina Urbina ABSTRACT The effects of a strong acid and strong base were determined by measuring the pH of a buffered and unbuffered systems. Moreover, one observes the common-ion effect on a dynamic equilibrium in this experiment. One observes the way equilibrium shifts when the concentration of one species changes. This also applies to changes in temperature in the system. Overall, this experiment take a look at LeChatelier’s principle. INTRODUCTION The purpose of this experiment was equilibrium shifts in a […]

Measuring the Melting Points of Compounds and Mixtures

Overview Our unknown for this experiment was #4. The experiment had two different sections with different goals in each.  In the first part, we measured the melting points of benzoic acid and mandelic acid, as well as different mixtures of these.  The mixtures were: 80% benzoic with 20% mandelic, 60% benzoic with 40% mandelic, 40% benzoic with 60% mandelic, and 20% benzoic with 80% mandelic.  This was done to obtain information about the eutectic composition and temperature.  In the second […]

Gravimetric Determination Of Soda Ash – Lab Report

By: Hector Manuel Gonzalez Avalo, lab partner; Benjamin Horrocks Introduction:  Soda Ash (Na2O sodium oxide) is derived from sodium carbonate. Sodium oxide is a salt used mostly for ceramics and crystal making. Among other applications of soda ash is its application in “water glass”, a raw material that contains sodium oxide. Water glass is used as a source of sodium for several industrial products, such as; laundry detergents, binders and adhesives. As a chemist the determination of the amount of this […]

Quantum Chemical Models of Electronic Transitions of Conjugated Dyes

By: Brittany Schaum Abstract                   UV-Vis spectroscopy was used to determine the energy of transition, △E  , from the highest occupied molecular orbital (HOMO) to the lowest unoccupied molecular orbital (LUMO) of several cationic dyes. Each dye contains a conjugated, hydrocarbon π system with nitrogens at each end, which act as potential barriers for the π electrons in these systems. In this experiment, we have treated each dye as a one-dimensional “particle in a box” in order to simplify the […]

Synthesize Eutectics and Melting Point Comparison

Purpose of the Experiment The purpose of this experiment was to synthesize various eutectics and compare the melting points of the eutectics to their original components. In this experiment, we made four different eutectics. A mixture of choline chloride and urea was made, as well as a mixture of choline chloride and water. A mixture of choline iodide and urea was made, as well as a mixture of choline iodide and water. These eutectics were made because they were the […]

Solution Density and Partial Molar Volume as Functions of Concentration

Solution Density and Partial Molar Volume as Functions of Concentration By: Melissa Michaels Abstract A simple NaCl solution was used to model densities of solutions versus the molality of that solution.  This simple solution was then done with organic solutions including methanol, 1-propanol, and 2-propanol.  Using the derivative of the slope when plotting density versus molality we were able to show the partial molar volumes of the solutions.   1. Introduction The purpose of this experiment was to demonstrate the […]