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Drop Size Lab - Stephanie Pham Drop Size Lab IB Chemistry...

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Stephanie Pham Drop Size Lab IB Chemistry SL Johnson High School October 26, 2009 Candidate ID Number: 003342-005 Design- Instructor Directions: Investigate Drop Size. Research Question: Is the mass of a liquid drop affected by the size of the pipette from which it is dispensed? Purpose: The aim of this lab is to determine if there is a relationship between apparatus size and drop size of a liquid. In order to investigate this, numerous pipettes in various sizes will dispense liquid onto a plastic weighing tray, and the drop size will then be measured by determining the mass of it. The data will be analyzed accordingly. Variables: independent variable - 5 different pipette sizes will be used dependent variable - the mass of the drop control variables (will be used for the duration of the lab) o type of liquid- tap water o temperature of liquid- at a constant room temperature o pipette filler- the same one throughout the experiment o height from which the liquid is dispensed- approximately 10 cm Materials and Equipment: Plastic weighing trays Acculab Balance (readability ± 0.001 g) Ring stand 1
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Buret clamp Thermometer (± .5 °C) Pipette filler Pyrex 1 in 1/100 mL pipette K Exax 2 mL pipette Kimax 5 in 1/10 mL pipette Falcon 10 in 1/10 mL pipette Sibate 25 mL pipette Pyrex 250 mL beaker Paper Towels Chemicals: Tap Water (H O) Safety Notes: Water is generally harmless to the eyes and skin, but safety goggles will be worn during the lab and hands will be washed after completion of the lab as a precaution. Procedure: 1. Fill a 250 mL beaker with tap water. 2. Place a thermometer (± .5 °C) into the beaker and wait two minutes. After two minutes have passed, record the temperature of the water. 3. Attach the buret clamp to the ring stand. 4. Using the Acculab balance (± 0.001 g), measure the mass of the plastic weighing tray and record. Place the plastic weighing tray underneath the buret clamp.
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