An Investigation into the structure and properties of Sodium Sulfate
Thomas Previti
Chemistry Laboratory 1011, Section 17
Instructor: Sachi
October 12, 2016
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Discussion and Scientific Explanations The unknown compound was found to contain sodium and sulfate throughout many different chemical tests. These chemical tests also helped to determine that the compound was polar and a conductive ion.
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A known solution of Na2SO4 was made and the unknown solution was made. Both solutions were mixed with BaCl2 twice to create a reaction. The solutions were all put into test tubes to be put into the centrifuge to separate out the precipitate, NaCl. The precipitate was then removed from the tubes and put on filter paper to dry. Once they dried the filter paper with precipitate was weighed. Then the mass of the filter paper was subtracted from the total weight, to find the mass of the precipitate, shown in Table 3. The mass of NaCl precipitate was used to find the amount of NaCl present. Then the amount of NaCl was used to determine the amount of Na2SO4 present. Then this number was used to determine the experimental molar mass of Na2SO4. The experimental molar mass was compared to the actual molar mass. All the values of these calculations are shown in Table 5. The actual molar mass and experimental molar mass were very close and resulted in a percent yield of …show more content…
The only real weakness was during the quantitative analysis. The mixed solution had to be divided into different test tubes and put into the centrifuge machine to separate out the precipitate from the solution. There was a large amount of solution that was put into a lot of test tubes that all had to be ran through the centrifuge. The large amount of test tubes that had to be filled could have resulted in some precipitate being lost or not completely separated out from the solution. This large test sample has the possibility to result in slight errors in the
Solid A was identified to be sodium chloride, solid B was identified to be sucrose, and Solid C was identified to be corn starch. Within the Information Chart – Mystery White Solid Lab there are results that distinguishes itself from the other 4 experimental results within each test. Such as: the high conductivity and high melting point of sodium chloride, and the iodine reaction of corn starch. Solid A is an ionic compound due to its high melting point and high electrical conductivity (7), within the Information Chart – Mystery White Solid Lab there is only one ionic compound which is sodium chloride, with the test results of Solid A, it can be concluded that is a sodium chloride. Solid B was identified as sucrose due to its low electrical
The purpose of the Unknown White Compound Lab was to identify the unknown compound by performing several experiments. Conducting a solubility test, flame test, pH paper test, ion test, pH probe test, conductivity probe test, and synthesizing the compound will accurately identified the unknown compound. In order to narrow down the possible compounds, the solubility test was used to determine that the compound was soluble in water. Next, the flame test was used to compare the unknown compound to other known compounds such as potassium chloride, sodium chloride, and calcium carbonate. The flame test concluded that the cation in the unknown compound was potassium. Following, pH paper was used to determine the compound to be neutral and slightly
The question that was proposed for investigation was: Can the theoretical, actual, and percent yields be determined accurately (Lab Guide pg. 83)?
Furthermore, you will compare their reactions with water, universal indicator, vinegar and iodine solution to discover what the mystery powder is. Purpose: To identify the mystery powder based on its physical and
In response to the question set, I will go into detail of the study, consisting of the background, main hypotheses, as well the aims, procedure and results gathered from the study; explaining the four research methods chosen to investigate, furthering into the three methods actually tested.
...g. Ed. X. J. Kennedy and Dana Gioia. 12th ed. New York: Pearson, 2013. 549-51. Print.
Retrieved on June 12, 2006 from the World Wide Web at: http://www.blackwell-synergy.com/links/doi/10.1111/j.1745-6622.1997.tb00124.x.
56, No. 3 (1989), pp. 543-569. The Johns Hopkins University Press. JSTOR. Web. 24 April 2014.
...ondon University. Gerald Duckworth & Co. Ltd. And Aldine Publishing Company. Chicago, Illinois.Full Length Text
INSTRUCTOR NOTE: DO NOT CUT AND PASTE THE ABSTRACT! Your response must use active reading and paraphrasing into your own words. Your work may be matched with the hard-copy of the article. The assignment will also be processed through the Blackboard SafeAssignment feature. It is unethical to attempt to complete an assignment of this nature by cutting and pasting from the abstract.
This article hasn’t provided an introduction; however a lengthy summary of the study which identifies the problem, purpose and rationale for the research study has been provided in the background. The introduction should give the reader a general sense of what the document is about, and preferably persuade the reader to continue reading. This prepares the reader for reading the rest of the document (Burns & Grove, 2001 p.636; Nieswiadomy, 2008 p.380; Stockhausen and Conrick, 2002).
9 When I first wrote this paper, I wrote it as a presentation. I took this quote off of an article found on Lexis Nexis and did not mark down the information. I have since been unable to find my print out or log on to Lexis Nexis, as it has to be through a university computer. A final version of this paper will include the citation. Sorry, folks.
This assignment is my own work, presented in my own words, ALL sources of information have been cited and any direct quotations are contained within quotation marks.
borate) and 1.0 g. of sodium hydroxide in 20 mL of warm water. It may
There is also the potential of human error within this experiment for example finding the meniscus is important to get an accurate amount using the graduated pipettes and burettes. There is a possibility that at one point in the experiment a chemical was measured inaccurately affecting the results. To resolve this, the experiment should have been repeated three times.