Prac Manual CHE10001

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School

Swinburne University of Technology *

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Course

1

Subject

Chemistry

Date

May 15, 2024

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docx

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71

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CHE10001 Chemistry 1 Laboratory Manual Compiled by Marylou Molphy and Daniel Eldridge Edited with the assistance of Sheila Curtis & Andrea Chisholm Faculty of Science, Engineering & Technology
(2) CONTENTS Experiment Title Section Lab Timetable Canvas 1 Apparatus and Techniques in Chemistry 1.1 2 Investigating Chemical Reactions 2.1 3 Titration of Lemon Juice 3.1 4 What solution is that? 4.1 5 Identification of an unknown solid diprotic acid 5.1 6 Buffers & pH titrations 6.1 7 Spectroscopic analysis of sodium salicylate 7.1 8 Kinetics of dye degradation and bath bombs 8.1 The experiments detailed in this manual require adequate knowledge of appropriate techniques and safety precautions. Before attempting any of the experiments, students should be familiar with laboratory safety and must have passed the Online Safety Induction.
(3) Assessments Reports A report is to be submitted for each prac – due one week after completing your experiment Safety Induction Online Induction must be passed (100%) to enable you to commence the practical component. This is accessed through Canvas, Subject Code Access Laboratories: Safety Induction* Practical Techniques Exam You will be asked to accurately determine a concentration of an unknown solution, using techniques and experienced gained through the course of the semester. This exercise is done under exam conditions. Assessment There are two forms of assessment for the practical component: 1. Reports Each report will be marked according to a marking scheme that is based on your raw results, the interpretation of these results, and answers to questions. All reports will be given the same weighting and contribute 20% of your overall mark for the unit. Penalties for failing to observe safety and other rules will be deducted from your overall mark and could result in a fail in the subject. 2. Practical Exam At the end of the semester there will be a practical exam, worth 10% of the overall mark in the unit. More information will be provided during the course of the semester. These two components form the practical mark for this Chemistry unit, which is worth 30% of the overall mark in the unit. Safety Induction You are required to read through the safety material online and complete a short online safety induction. Only this information will be tested. By gaining a mark of 100% and thereby passing this induction, it will enable you to commence the lab work. The first active lab session is in Week 3 or 4 depending on your timetable. Please ensure that you have completed the induction prior to this session. See the unit site on Canvas for full details: https://swinburne.instructure.com
(4) YOU WILL NOT BE ABLE START EXPERIMENTS UNTIL THIS IS DONE. You will excluded from the lab and receive zero marks for any work missed. For full and additional details, please refer to the Lab Reference Manual on Canvas Helpful hints! Calculating averages and deviations You will frequently be asked to calculate an average result and a deviation, as a means of assessing accuracy and precision. There are many different ways that scientists calculate deviation. Throughout the unit, we will use the following convention: 1) Calculate the average of your best 3 results - (sum of best 3 results, divided by 3) 2) Compare your average value to the 3 results that you used in calculating your average. Identify which of the 3 values lies furthest from the average. 3) Calculate the difference between your average value and the value that was furthest away and quote this as your deviation. This is referred to as the maximum deviation. Eg. If 4 results are obtained to be 19.14,19.22, 19.23 and 19.25 mL: 1) Omit 19.14 – only use your best 3 to calculate the average: - (19.21+19.22+19.25)/3 = 19.233 mL 2) Furthest value away is 19.25 mL 3) 19.25 – 19.233 = 0.0167 = 0.02 mL (just use one digit) Result = 19.23 0.02 mL Unit conversions to be aware of… 1 cm 3 = 1 mL 1 dm 3 = 1 L
(5) 1 L = 1000 mL 1000 mg = 1 gram
(6) Practical Write-Up Hints and Tips DON’T use the first person (I, my, our, we). DON’T use “flowery” language. Try to write as “scientifically” as possible – use a very direct approach and don’t draw out a statement to take up more space; be concise. Aim: State what you wanted to do and how you wanted to do it – no fluffing around! Example: Aim: To determine the concentration and percent composition of tartaric acid in red wine by pH titration. Method: Write in paragraph (not dot points) a procedure for how you conducted the experiment. Fine details are not necessary at this level. Someone should be able to read your method and then, if necessary, repeat your work. Example: Method: A sample of fresh red wine was vacuum filtrated to remove all pips sediment. An aliquot of 20 mL of the filtrate was taken and diluted to 200 mL. Finally, 20 mL aliquots of the dilute red wine were titrated against ~0.1 M NaOH until concordancy was obtained. Results: Include calculations, tables and graph but do not discuss your data. See next page for notes on writing discussions and conclusions
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