Read over Techniques #2, 4, 5, 6, and 9 in the Demonstrations of Nine Practical Lab Techniques booklet.
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1 Practical Assessment 1 includes: Technique #2 - Use of a Pipette Technique #4 Weighing Technique #5 Use of a Bottle-Top Dispenser Technique #6 Gravity Filtration Technique # 9 Rotary Evaporator Student preparation: Read over Techniques #2, 4, 5, 6, and 9 in the Demonstrations of Nine Practical Lab Techniques booklet.
2 Come to your assessment at least 5 minutes early and wait outside the lab. Remember to bring: 1. Lab coat 2. Goggle 3. Pen 4. Calculator You will be asked to draw two techniques from a draw box and perform the tasks given. Read over the following marking scheme for each technique so that you are prepared to answer questions related to the techniques, as well as carrying out the techniques to perform the tasks. During the assessment, be confident and be in control, and be knowledgeable. Good luck!
3 Assessment Scheme: Maximum score = 15 s Does not label glassware minus 1 Technique #2 - Use of a Pipette U S G E Comment Knowledge of keywords: acclimatization, meniscus, volumetric pipette, measuring pipette Use of pipette bulb Acclimatize technique Wiping the outside of the pipette before adjusting to the mark Control of pipette while adjusting the liquid level to the mark Bring to eye level Dispensing technique draining with tip touching wall of containing and waiting for 10 seconds
4 Assessment Scheme: Maximum score = 15 s Does not label glassware minus 1 Technique 4 - Weighing U S G E Comment Knowledge of the two different methods of weighing Check balance is zeroed and the balance chamber is clean Record mass to proper number of significant figures Removal of weigh boat from the balance before adding sample Set the weigh boat on a clean surface (on Kimwipes) Close doors before reading mass Leave balance with doors closed and balance turned off Labeling of glassware
5 Assessment Scheme: Maximum score = 15 s U = unsatisfactory (0); S = satisfactory (1); G = Good (2); E = Excellent (3) Does not label glassware minus 1 Technique 5 Bottle-Top Dispenser U S G E Comment Knowledge of keywords: bottle-top dispenser, accuracy of a bottle-top dispenser Ability to set the dispenser to the approximate volume specified Ensure the dispenser is free of air bubbles Use graduated cylinder to check preset volume Proper use of dispenser pump Record volume to proper number of significant figures.
6 Assessment Scheme: Maximum score = 15 s Does not label glassware minus 1 Technique 6 Gravity Filtration U S G E Comment Knowledge of keywords: name different types of filter papers, decantation, washing, purpose of tearing a small corner of the filter paper, filtrate Selection of proper filter paper for the funnel provided Folding of filter paper Apparatus setup height of filter rack, position of the funnel and the beaker Wetting of the filter paper should fit snugly into the funnel, should have good flow Decant technique Wash technique Transfer technique proper use of rubber policeman and rinsing
7 Assessment Scheme: Maximum score = 15 s Does not label glassware minus 1 Technique 9 Rotary Evaporator U S G E Comment Knowledge of the purpose of using the equipment Use of the circular clip in the correct orientation Close the air inlet valve Water to the aspirator on full strength Water to the condenser enough for circulation Assembly of the rotary evaporator Disassembly of the rotary evaporator
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