Order ID 53563633773 Type Essay Writer Level Masters Style APA Sources/References 4 Perfect Number of Pages to Order 5-10 Pages Description/Paper Instructions
Determination of the Molar Mass of Magnesium by a Titrimetric Method
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CHM001: Laboratory Report Sheet
Experiment 2: Determination of the Molar Mass of Magnesium by a Titrimetric Method
Student Name: Lab supervisor: –
Marking Criteria
There are 7 marks allocated for how well you do each of the titrations (HCl standardisation and mass of Mg titration).
Note this 1st part is most important. If your titrations are poor you should do them again. It is better to have good work here than to answer the last few questions.
Note that you must get your work signed off and marked by demonstrators as you go.
HCl Mass of Accuracy Standardisation Magnesium Average titre value within 0.1 mL of the expected value 4 marks 4 marks within 0.2 mL 3 marks 3 marks within 0.3 mL 2 marks 2 marks Outside this range Precision
1 mark 1 mark Three values within 0.1 mL of each other 3 marks 3 marks within 0.2 mL of each other 2 marks 2 marks Outside this range 1 mark 1 mark NB: Burette readings, and therefore titres, are to be read to 2 decimal places. Make sure you have done this.
Calculations /4 marks Timeline /2 marks Total /20 marks Mass of magnesium used: ………0.0312……… (g)
Molarity of NaOH solution………….0.0481…………… mol L-1
HCl standardization: (Require 3 that agree no matter how many titrations it takes)
Titration Rough 1 2 3 Final burette reading (mL) Initial burette reading (mL)
Titre (mL)
22.50 0.00
43.21 22.50
20.81 0.00
41.72 20.81
Average titration value ………………………………………………………………….. mL
- Use your average titration volume to calculate the average number of moles of NaOH used in the titration. You may wish to include or discard your rough titre volume.
- Write a balanced equation for the reaction between HCl and NaOH, and the average number of moles of acid in a 20 mL sample.
- Calculate the total amount of HCl in the 100mL volumetric flask.
Molar mass of magnesium titration: (Require 3 that agree no matter how many titrations it takes)
Titration Rough 1 2 3 Final burette reading (mL) Initial burette reading (mL)
Titre (mL)
11.00 0.00
21.00 11.00
31.10 21.00
41.30 31.10
Average titration value ………………………………………………………………….. mL
- As for the standardization section calculate the amount of HCl in the 100 mL volumetric flask containing magnesium.
- Using your results from 3 and 4 calculate the number of moles of H+ consumed by the magnesium reaction.
- What is the gas produced during this reaction?
- With your answer to 6 in mind write a balanced reaction for magnesium dissolving in HCl.
- Use this balanced reaction equation and your answer to 5 to calculate how many moles of magnesium have reacted.
- Using the accurate weight of magnesium introduced at the beginning of the experiment, calculate the molar mass of magnesium.
- Look up the average molar mass of Mg in the periodic table (last page of your lab manual). If your calculated molar mass for magnesium differs from that listed can you think of any reasons
that might explain this?
- Summarize, in your own words, how the measurements and calculations you have performed during this experiment were used achieve the stated outcome (‘Determination of the Molar Mass of Magnesium’).
RUBRIC
QUALITY OF RESPONSE NO RESPONSE POOR / UNSATISFACTORY SATISFACTORY GOOD EXCELLENT Content (worth a maximum of 50% of the total points) Zero points: Student failed to submit the final paper. 20 points out of 50: The essay illustrates poor understanding of the relevant material by failing to address or incorrectly addressing the relevant content; failing to identify or inaccurately explaining/defining key concepts/ideas; ignoring or incorrectly explaining key points/claims and the reasoning behind them; and/or incorrectly or inappropriately using terminology; and elements of the response are lacking. 30 points out of 50: The essay illustrates a rudimentary understanding of the relevant material by mentioning but not full explaining the relevant content; identifying some of the key concepts/ideas though failing to fully or accurately explain many of them; using terminology, though sometimes inaccurately or inappropriately; and/or incorporating some key claims/points but failing to explain the reasoning behind them or doing so inaccurately. Elements of the required response may also be lacking. 40 points out of 50: The essay illustrates solid understanding of the relevant material by correctly addressing most of the relevant content; identifying and explaining most of the key concepts/ideas; using correct terminology; explaining the reasoning behind most of the key points/claims; and/or where necessary or useful, substantiating some points with accurate examples. The answer is complete. 50 points: The essay illustrates exemplary understanding of the relevant material by thoroughly and correctly addressing the relevant content; identifying and explaining all of the key concepts/ideas; using correct terminology explaining the reasoning behind key points/claims and substantiating, as necessary/useful, points with several accurate and illuminating examples. No aspects of the required answer are missing. Use of Sources (worth a maximum of 20% of the total points). Zero points: Student failed to include citations and/or references. Or the student failed to submit a final paper. 5 out 20 points: Sources are seldom cited to support statements and/or format of citations are not recognizable as APA 6th Edition format. There are major errors in the formation of the references and citations. And/or there is a major reliance on highly questionable. The Student fails to provide an adequate synthesis of research collected for the paper. 10 out 20 points: References to scholarly sources are occasionally given; many statements seem unsubstantiated. Frequent errors in APA 6th Edition format, leaving the reader confused about the source of the information. There are significant errors of the formation in the references and citations. And/or there is a significant use of highly questionable sources. 15 out 20 points: Credible Scholarly sources are used effectively support claims and are, for the most part, clear and fairly represented. APA 6th Edition is used with only a few minor errors. There are minor errors in reference and/or citations. And/or there is some use of questionable sources. 20 points: Credible scholarly sources are used to give compelling evidence to support claims and are clearly and fairly represented. APA 6th Edition format is used accurately and consistently. The student uses above the maximum required references in the development of the assignment. Grammar (worth maximum of 20% of total points) Zero points: Student failed to submit the final paper. 5 points out of 20: The paper does not communicate ideas/points clearly due to inappropriate use of terminology and vague language; thoughts and sentences are disjointed or incomprehensible; organization lacking; and/or numerous grammatical, spelling/punctuation errors 10 points out 20: The paper is often unclear and difficult to follow due to some inappropriate terminology and/or vague language; ideas may be fragmented, wandering and/or repetitive; poor organization; and/or some grammatical, spelling, punctuation errors 15 points out of 20: The paper is mostly clear as a result of appropriate use of terminology and minimal vagueness; no tangents and no repetition; fairly good organization; almost perfect grammar, spelling, punctuation, and word usage. 20 points: The paper is clear, concise, and a pleasure to read as a result of appropriate and precise use of terminology; total coherence of thoughts and presentation and logical organization; and the essay is error free. Structure of the Paper (worth 10% of total points) Zero points: Student failed to submit the final paper. 3 points out of 10: Student needs to develop better formatting skills. The paper omits significant structural elements required for and APA 6th edition paper. Formatting of the paper has major flaws. The paper does not conform to APA 6th edition requirements whatsoever. 5 points out of 10: Appearance of final paper demonstrates the student’s limited ability to format the paper. There are significant errors in formatting and/or the total omission of major components of an APA 6th edition paper. They can include the omission of the cover page, abstract, and page numbers. Additionally the page has major formatting issues with spacing or paragraph formation. Font size might not conform to size requirements. The student also significantly writes too large or too short of and paper 7 points out of 10: Research paper presents an above-average use of formatting skills. The paper has slight errors within the paper. This can include small errors or omissions with the cover page, abstract, page number, and headers. There could be also slight formatting issues with the document spacing or the font Additionally the paper might slightly exceed or undershoot the specific number of required written pages for the assignment. 10 points: Student provides a high-caliber, formatted paper. This includes an APA 6th edition cover page, abstract, page number, headers and is double spaced in 12’ Times Roman Font. Additionally, the paper conforms to the specific number of required written pages and neither goes over or under the specified length of the paper. GET THIS PROJECT NOW BY CLICKING ON THIS LINK TO PLACE THE ORDER
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