AQA Required practical for GCSE Chemistry, Trilogy and Synergy.
There are 15 video clips showing the reaction at 5 concentrations so that students can measure the time taken for the cross to disappear. These concentrations are repeated three times. The concentrations and repeats provided here link with the Collins Required Practical handbook but the tests can be used as a stand alone aid.
Concentrations are
40g/dm3
32g/dm3
24g/dm3
16g/dm3
8g/dm3
10cm3 of 1M hydrochloric acid is added each time. Practical was carried out at room temperature (22oC)
Students would normally be required to prepare their own concentrations by diluting 40g/dm3 sodium thiosulfate. We made the different concentrations required with orange squash so that the dilution effect could be clearly seen. This also enabled students to practice accurate volume measurements with safe solutions.
I developed this practical aid so that lower ability students could obtain a full set of effective results. Using the videos allows the students to focus on accuracy of measurement (they used their own stopwatches), reasons for repeats, prediction, pattern recognition etc without getting bogged down in multiple volume measurements and lost in a very long practical.
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It's an awesome resource, thanks very much. Just to let you know that for me the videos of 32g 2&3 didn't work.. The other 13 were fine though!<br />
Brilliant for COVID required practical activity
Amazing!!!! Thank you so much.
Some really useful resources, especially during 'lockdown' with no lab work! Many thanks for sharing, perhaps you had a crystal ball!
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