Essays on Crystallization

Research Question

The effect of increasing the concentration of two reactants, i.e. Calcium Chloride solution and Sodium Carbonate solution, on the percentage yield of Calcium Carbonate is to be studied in this experiment. The efficiency analysis for the production of Calcium Carbonate (also known as chalk) is to be carried out. The dependent variable in this experiment is the percentage yield of Calcium Carbonate, expressed as percentage (%). The independent variable is the concentration of the reactants, i.e. Calcium Chloride solution and Sodium Carbonate solution. The concentrations are expressed in moles/liter or moles/dm3. While the control variable is the mass of the ...

Literature review

In the history of the construction of sea structures in oil exploration, load and corrosion together with how those structures will be maintained have always posed a scientific nightmare. Chamberlain, Adam and other authors in a scientific journal illustrate that for a good design of an onshore structure, there should be a right proportion of the ingredients in order for the structure to give maximum life service. They all agreed that in order to achieve this, keen interest should be paid to the permeability, strength, and durability of the mixture. Finally, they added that for effective control of corrosion, ...

SUMMARY

This article explains the structure and history of Crevice pluton. The structures found inside the pluton are observed which include the moderate to steep penetrative foliation, top-to-west shallow ductile shear zones and subvertical northwest-striking mode I fractures of regional extent. A research was conducted to examine the inside architecture and age of deformation of Crevice pluton, near the main fork of the Salmon River. This investigation also attempts to examine the relation that is assumed to exist between the different fabric patterns of Crevice Pluton. Laser ablation technique was also used to analyze zircon from Crevice Pluton and ...

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Introduction and Literature Review

The value for a drug is significantly impacted by the dissolution rate, chemical stability and solubility of the drugs thereby impacting the pharmaceuticals efficiency as well. In the pharmaceutical industry multi-component crystals such as hydrates, solvates, co-crystals and salts have a major role during the design of new solids. Solid does not self-crystallize. It crystallizes in varied forms depicting random crystal properties. Various approaches are used to modify solids like Salting, Solvation, Hydration, and Polymorphism. Apart from these approaches, Co-Crystallization is a promising new approach to modifying solids (Nauha, ...

Introduction

Aspirin is a commonly used drug. One of the properties of aspirin is that it is an analgesic, meaning that it relieves of pain. Aspirin is also an antipyretic drug meaning that it relieves on of fever. It also has anti-inflammatory properties meaning that if readily relieves swelling from tissues (Ahluwalia, Sunita & Adarsh 231). Salicylic acid has two functional groups. One of the functional groups is the phenolic group while the other functional group is carboxylic acid group. The presence of these two functional groups means that salicylic acid can undergo esterification in two different reactions. In one reaction, ...

reinforced with Aluminium glassy alloys

Engineering

The effects of mixing time, sintering temperature, sintering time and pressure on mechanical properties of a metal matrix composite (MMC) reinforced with Aluminium glassy alloys

Introduction

Metal Matrix Composites (MMCs) are an important class of engineering materials because they can continually be adapted to suit the needs of manufacturing and newly available technology. MMCs using aluminium as a basic ingredient can be designed to meet particular needs for high performance materials. Duralumin™ was the first aluminium alloy demonstrating the ability to result in a material with very high temperature strength after solution treatment and aging (STA). Duralumin™ or ...

Introduction

Extraction, crystallization and melting point can be used as methods of separating mixtures. Extraction and melting points are employed on separating liquid-liquid mixtures whereas purification of elements utilizes crystallization as their method of separation with impurities. Separation of mixtures involves the distinction of the constituent elements of the mixture into their constituent elements. Separation of mixtures is based on characteristics of the constituent elements of the mixture. Chemical affinity and density are the most utilized properties in organic compound mixtures.

Discussion

Methods of preparing the substance include the use of extraction from a mixture which is based on the principle of ...

The G- protein coupled receptors (GPCRs) include a group of receptors that still undergoes intense research. Such research occurs at both academic levels and in the pharmaceutical industry. Several advancements occurred recently in the structure of the G- protein coupled receptors. There appeared new crystal structures as well as ground states and active states. Such advancements in the structure of these proteins helped in the further understanding of the receptors especially in the therapeutic fields. It also possesses an immense impact on the GPCR field (Andrew, 2008, pp.6). Several fundamental factors help in the understanding of these receptors. Such ...

Abstract

The experiment conducted is a palladium catalyzed coupling of a terminal alkyne to 4-Iodonitrobenzene. 1.25 mL of 95% ethanol was added along with 93mg of 4-Iodonitrobenzene, 80mg piperazine hexahydrate and 4 mg CuI, in a 5mL clean and dry conical vial plus spinvane. 80 µL (density 0.898 g/mL) of tetrahydro-2-(2-propynyloxy)-2H-pyran was added to the solution through an automatic pipette. To this add 3 mg of Pd(OAc)2, refluxed and stirred under a water cooled condenser for half an hour until it turned dark brown. The reaction mixture was then poured into a clean and dry evaporating dish and heated gently with a ...

Abstract

In this experiment, 5 mL of toluene solution was transferred in a 25 mL round bottom flask and then 0.40 g maleic anhydride and 0.4 g E, E-2, 4-hexadien-1-l added. Ethyl acetate was used as a solvent to carry out a TLC analysis on the mixture produced after reaction completion mainly to determine the presence of any starting material in the mixture. The reaction mixture was then slowly cooled to room temperature. There was crystallization taking place as the reaction cooled, white crystals were formed. The mixture was further cooled in for 10 minutes in a water bath to promote crystallization to ...

PART-1 DILUTIONS

a) the technique of transferring an exact amount of liquid from one container to another a) The process of achieving a precise volume in one container while still being able to thoroughly mix the contents.

While pipetting, one should take care to avoid errors. The reading is taken by positioning the eye in correct point with the lower meniscus. Water is added little at a time to the volumetric flask to enhance proper mixing. Tap water is undesired since it has impurities plus ions, which interferes with the results of the experiment. When the water meniscus is almost fill line a “disposable pipette” ...