Separation of a Mixture: Unknown # 12-Green
Chemistry 221 with Professor Thomas Quale May 2012 Formal Lab Report
An unknown sample, # 12-Green, was separated into its individual variable components, iron, ammonium chloride, silicon dioxide, and sodium chloride. The techniques used to separate the components of unknown # 12-Green, magnetism, sublimation, extraction, and filtration, were chosen based on the unique properties of each component. Using these separation techniques, each substance was extracted and the composition of unknown # 12-Green was 16% Fe, 15% NH4Cl, 59% SiO2, and 9% NaCl with a 1% uncertainty due to the loss of 0.0369g of the initial mass.
A mixture is two or more substances (elements and/or compounds) that are physically combined (2). Because the substances do not react chemically, each individual component of the mixture retains its individual identity and properties. Therefore, knowing that each component of a mixture retains its own fundamental physical properties, a scheme can be created to separate the components and determine the percent composition of a mixture (1). The separation techniques are based on the physical properties of the components. Some of the physical properties used in this experiment to separate the mixture include the following: Solubility: The solubility of a substance, called the solute, indicates how easily it can dissolve in a solvent, which is often a liquid (1). Boling Point: The boiling point is the temperature at which a substance changes from the liquid state to the gaseous state (1). Sublimation: Sublimation is the ability of some substances to pass directly from the solid state to the gaseous state without the appearance of the liquid state (1). Particle Size: Particle size refers to the diameter of a grain of a solid substance. This property can be used to separate solid substances based on their different particle sizes (2). Magnetism: Magnetism is a physical property...
References: 1. Rock Creek Chemistry Department. Separation of a Mixture, Separation Techniques I. Portland Community College Library Reserves. https://library.pcc.edu/articles/1188197. 5227/1.PDF (accessed May 28, 2012).
2. Silberberg, M.S. Chemistry: The Molecular Nature of Matter and Change, 6th ed.; The McGraw-Hill Companies: United States of America, 2012
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