"Precipitation" Essays and Research Papers

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Selective Precipitation of the Barium Magnesium Group ABSTRACT The purpose of this lab was to identify the cations from the barium magnesium group present in an assigned unknown solution through selective precipitation. This was a qualitative lab where the theory of the common ion effect was used in several steps. Once the experiment was completed, it was determined that unknown solution #4 contained Ba2+, Sr2+, and Mg2+ ions. INTRODUCTION Selective precipitation is a part of chemistry...

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Protein Precipitation Methods

Abstract There are many methods employed to precipitate proteins out of solution. In this experiment we manipulated many physical and chemical variables in order to achieve purification of a protein via precipitation. In the first part of the experiment we purified the protein casein by modifying it’s pH. In the second part of the experiment we manipulated the ionic strength of albumin in egg whites, in a process called salting out. By manipulating these chemical properties we were able to...

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Stoichiometry of a Precipitation Reaction

Stoichiometry of a Precipitation Reaction Purpose: The purpose of this lab is to calculate the theoretical, actual, and percent yield of the product from a precipitation reaction. Also, to learn concepts of solubility and the formation of a precipitate. Procedure: Weigh out your 1.0g of CaCl2-2H20 and put it into the 100mL beaker, Add your 25mL of distilled water and stir to form the calcium chloride solution. Next, use stoichiometry to determine how much Na2CO3 and put it into a small...

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Stoichiometry of a Precipitation Reaction

mole CaCO3 = 0.68g CaCO3 Show the calculation of the percent yield. = Actual yield/Theoretical yield x 100 = 0.5/0.68 x 100 = 73.5% Conclusion: The objective of the experiment is to predict the amount of product produced in a precipitation reaction using stoichiometry. Secondly, the experiment accurately measures the reactants and products of a reaction. Also, the experiment is to determine actual yield vs. theoretical yield and to calculate the percent yield. For example in this...

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Lab Experiment Stoichiometry of a Precipitation Reaction

Ocean County College Department of Chemistry Stoichiometry of a Precipitation Reaction Submitted by Hendy Zelishovsky                                                                                                                                                                               Date Submitted:   4/26/2012 Date Performed:  4/25/2012 Lab Section: Chem-180-DL1         Course Instructor: Dr. Cynthia Spencer                                                             Purpose ...

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Precipitation and Urgent Message

Good Morning, today I xxxx am here to talk to you about ‘’The Earth” Let me begin by a famous quote- “ The Earth provides enough to satisfy every man's needs, but not every man's greed.”  ― Mahatma Gandhi The urgent message is “Save the Earth”. It’s a message that has been heard before and consistently being spread throughout the world. In this time that I have to talk to you, I want to show to you, how deep a mess we are in, with environmental crisis and how we can get out of it. It warns us...

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Lab Report of the Preparation of Cds

filtration, centrifugal separation & precipitation washing 2. To understand the relation between precipitation state % precipitating conditions 3. To learn the way to examine whether reactants are fully precipitated 4. To learn the principals of powder material synthesizing through room temperature solid phase method & liquid phase method directional growing crystal form of precipitation Experiment Principals 1.the process of precipitation forming constitutive crystal ion accumulating...

Free Solid, Ice, Precipitation 867  Words | 4  Pages

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Gravimetric Determination of Calcium

Gravimetric Determination of Calcium ABSTRACT Determining the mass of a pure compound is a method of a gravimetric analysis. One of the gravimetric analyses is the precipitation; it is a method of separating the analyte from the unknown sample as a precipitate where it will be filtered and converted into a known composition that can be weighed to determine its mass (Skoog et al, 2013). Determining the mass of calcium by using gravimetric analysis was the objective of the experiment. A 25 mL...

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Equatorial Regions

of continents between 20o and 40o north and south of the equator. Humid Subtropical climate is known for hot humid summers and mild. The rain falls throughout the year.  The regularly high temperatures evaporate water, which causes humidity and precipitation.  The high humidity in this region makes summer temperatures feel even hotter.  Humid Subtropical areas usually experience strong storms such as tornadoes and hurricanes.   Tropical Wet/Dry Tropical Wet/Dry is found near the equator, usually...

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Writing Assignment #3—Drought The National Drought Mitigation Center conceptually defines drought as “a protracted period of deficient precipitation resulting in extensive damage to crops, resulting in loss of yield”. Three indicators of drought include below normal soil moisture, reduced stream flow, and, most obviously, lack of precipitation. These indicators can be kept track of in order to help mitigate the effects of drought. The U.S. Drought monitor makes maps of the United States...

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