Category : Natural Sciences

The Standardization of NaOH and KHP

By: Juno Kim Introduction In this experiment the concentration of potassium hydrogen phthalate (KHP) in an unknown sample was determined through volumetric analysis. The volumetric analysis allows for the calculation of the unknown amount or concentration by a reaction with a known amount of reagent. For this lab, the unknown potassium hydrogen phthalate sample was titrated with a standardized sodium hydroxide solution. A standard solution has an accurately known concentration and for this experiment sodium hydroxide was standardized with a […]

Annealing – Materials Lab Report

By: Jaime Rodriguez Introduction:   This lab involves performing a technique called annealing. The purpose of annealing is to alter the properties of a material by heating it. When a material is annealed it is softened, and made more ductile and malleable. It is also made more corrosion resistant. Since the material is cooled slowly, it allows for dislocations to be healed, as they are moved to surfaces and grain boundaries. The purpose of this lab is to examine how […]

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 […]

Microbiota of the Skin

By:  Jacob Lucht Purpose: The purpose of this experiment was to determine the type or types of bacteria living in each person’s skin by taking a sample from the nose and plating it on a selective, differential media to culture it and then using polymerase chain reactions to amplify the DNA of the bacteria and gel electrophoresis to determine which type of bacteria was present.   Theory: The human body has a large number of bacterial species living on and […]