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Investigating the heating and cooling curves of stearic acid wax.

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Introduction

C/W G.C.S.E Coursework 15 /05/02 Andrea Rondal 9M Investigating the heating and cooling curves of stearic acid wax. Results Table Time (mins) Temperature [C�] Observations 0 22 Opaque, solid 1 21 2 23 3 25 Melting at the bottom 4 28 5 33 6 36 Translucent at edges 7 41 8 46 9 51 Opaque at the top 10 55 Above water level melts 11 57 12 60 13 91 All wax translucent, liquid 14 85 15 86 16 71 A bit cloudy at the bottom 17 66 18 63 19 60 20 58 Very opaque at the bottom 21 56 22 56 23 51 24 56 All opaque, solid C/ W Conclusion 21/05/02 The results of the melting and solidifying of the stearic acid, shows me that it melted at 91C�. ...read more.

Middle

At room temperature (24C�) the particles are close together by a rigid lattice. They only vibrate a little in their fixed positions. When the particles have gained enough energy from the heat (24-91C�), they start to vibrate more and they manage to break free from the lattice. The particles gain then so much energy (91C�) that they have enough to move around and to escape. C/W Evaluation 21/05/02 The results of the melting and solidifying curves of stearic acid weren't the results that I was expecting. At the beginning when the temperature was 22C� (room temp) I expected the temperature to increase, but instead, it went down to 21C� and the next minute it went up again to 23C�. ...read more.

Conclusion

Next time I would use a data logger, the data logger will take more accurate results than me, because it is exact it will take the readings at the exact minute ant the temperatures. I will also try and use a 2nd clamp stand to hold the thermometer in the centre of the wax, so I wouldn't have to take out the thermometer every time I need to take a reading, which if I do this it will affect the thermometer reading. The stearic aid that I used was impure and already used, so next time, I would use pure stearic acid wax to check it does melt at 70C�. Also repeat the experiment 2-3 times to work out an average of each recording. ...read more.

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