2019 Year 12 IB Extended Essays

adjacent to each other in the same room over the formation process. Therefore, any error created by the temperature should affect all samples resulting in a systematic error.

M ATERIALS AND A PPARATUS

- 23g of gelatine powder - 55g of cobalt (II) chloride - 1dm 3 of deionised water - 1dm 3 of 808 ammonia - 1x 30cm Ruler ± 0.1cm

- 1x 100cm 3 Measuring cylinder - 1x Electronic balance ± 0.0001 g - 1x Hot plate - 1x Test tube rack (needs space for 15 test tubes) - 5 x 100cm 3 beaker - 15 x test tubes. 1.5cm diameter, 16cm tall - 1x Masking tape - 1x White board marker - 1x Glass rod

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