An Investigation into the structure and properties of Sodium Sulfate Thomas Previti Chemistry Laboratory 1011, Section 17 Instructor: Sachi October 12, 2016 My signature indicates that this document represents my own work. Outside of shared data, the information, thoughts and ideas are my own except as indicated in the references. I have submitted an electronic copy through Blackboard to be scanned by TurnItIn.com. In addition, I have not given aid to another student on this assignment. 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. …show more content…
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
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
Directions: For each of the questions below, prepare an insightful and supported answer. Strengthen your arguments with text-based evidence and artful observations. This document will be submitted to Turnitin.com on Thursday, September 1 before 7:00 A.M., so be sure to convey original and thought-provoking answers that are YOUR OWN. Please print your answers for Thursday’s Seminar.
...g. Ed. X. J. Kennedy and Dana Gioia. 12th ed. New York: Pearson, 2013. 549-51. Print.
Studies, Vol. 25, No. 4 (Mar., 1995), pp. 447-464. Published by: Sage Publications, Inc. Article Stable URL: http://www.jstor.org/stable/2784403
By Justin Kaplan. (Penguin Group (USA), 2006. Pp. 208. Prologue, content, acknowledgements, sources, index. $13)
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.
...ondon University. Gerald Duckworth & Co. Ltd. And Aldine Publishing Company. Chicago, Illinois.Full Length Text
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.
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
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.
...form 〖PbCrO〗_4 and then process it through a filter. After filtering the 〖PbCrO〗_4 I had to dry the 〖PbCrO〗_4 residue in the drying oven for 30 minutes at 80℃. Then let it cool for 5 minutes and weigh it and finally make a few calculations to obtain the theoretical, actual, and percent yields of 〖PbCrO〗_4. I was able to fulfill the experiment because I obtained all the answers to the equations in an accurate amount. I believe this experiment was a success due to my hypothesis of, If physical methods are used to separate 〖 PbCrO〗_4 precipitate from the reaction mixture then I can successfully calculate the theoretical, actual, and percent yields, being correct.
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.
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.
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.
borate) and 1.0 g. of sodium hydroxide in 20 mL of warm water. It may