2. Methods

Step by Step Procedure for preparing test tube for experiment...

Pure Water

Step 1:   Prepare a mixture of 10 g of salt and 50 g of ice
Step 2:   Mix the mixture of salt and ice in a beaker using the stirrer until the salt has             dissolved.
Step 3:   Heat 50ml of water to 40°C in a plastic test tube
Step 4:   Using a crucible tong,move the test tube to the beaker containing the mixture of     salt and ice
Step 5:   Insert a temperature datalogger into the beaker itself
Step 6:   Use a crucible tong to allow the test tube to stand upright in the beaker
Step 7:   Insert a data logger into the test tube
Step 8:   Start the timer once the test tube is standing upright in the beaker
Step 9:   Every 10 minutes,take down the temperature of the beaker and the two test tubes
Step 10: When the data logger’s temperature remain stagnant,stop the timer
Step 11: Record the time it took in a log book
Step 12: Repeat step 1 to step 9 for different                                                                           temperatures (40°C,50°C,60°C,70°C,80°C,90°C)

Salty/Sugary water

Step 1:   Prepare a mixture of 10 g of salt and 50 g of ice in a container
Step 2:   Mix the mixture of salt and ice using the stirrer until the contents have dissolved
Step 3:   Prepare a mixture of 10 g of salt/sugar and 50ml of water in the plastic test tube
Step 4:   Mix the mixture thoroughly with a stirrer until the contents in the test tube are dissolved
Step 5:   Heat the contents in the test tube to 40°C
Step 6:   Use a crucible tong to move the text tube to the beaker containing the mixture of salt and ice.
Step 7:   Use the crucible tong to allow the test tube to stand upright in the beaker
Step 8:   Insert a temperature datalogger into the test tube
Step 9:   Once the test tube is standing upright in the beaker,start the timer
Step 10: Every 10 minutes,take down the temperature in the test tube
Step 11: Once the temperature has remained stagnant,stop the timer and record the time into the log book
Step 12: Repeat Step 3-11 for different temperatures(40°C,50°C,60°C,70°C,80°C,90°C) and different amounts of salt/sugar and water(10g,20g,30g,40g,50g)

To analyse the data,we would..

1. Ensure that the temperature of the water in the test tube is 0°C(with the datalogger)
2. Stop the stopwatch and record the time it took to reach 0°C
3. Record the data in the logbook.
4. A graph will then be created.The time(x axis) will be plotted against the temperature of the different initial temperature of the water(y axis).
5. The different temperatures will then be compared by the amount of time it takes to freeze.
6. We would then arrange the different initial temperature in order of how fast they froze,the one with the fastest temperature to freeze will be stated first.






No comments:

Post a Comment