Lesson 3 was spent on reading up on rambio about the various colours emmitted when ceratin metals are heated over the flame. This technique is known as flame test.
Today (lesson 4), we carried out a chromatography experiment, as well as a very fun hands-on flame test! First, we had to identify forgery in a cheque using chromatography. The first step was to cut up the written numbers, and then soak them in (a bit of) ethanol. Next, a few drops of the different ink solutions were dripped onto separate chromatography strips, which were then dipped in water. Pictures below to illustrate the experiment.
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| Cutting up the cheque |
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| Ethanol used |
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| Soaking the paper with ink in ethanol |
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| The chromatography set-up |
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| Chromatography strips at end of experiment |
Second is the flame test! Below are the really cool pictures of the flames when the different metals were held over them.
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| Potassium nitrate |
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| Barium nitrate |
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| Calcium chloride |
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| Sodium nitrate |
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| Copper (II) nitrate |
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| Magnesium |
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| Lead (II) nitrate |
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