GMU:DIY Biolab “Driver’s License”/Yang Li: Difference between revisions

GMU:DIY Biolab “Driver’s License”/Yang Li (view source)

1,074 bytes added , 19 January 2018

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 [[File:12.6 bio-lab first idea.008.jpeg|400px]]
+.1.2018
 However, there’s a problem which I’m not sure:
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 question：
 how to deal with the thing insoluble in water, for instance, oil, cosmetic...
+----
+After the work of 17th, I decided to focus on coffee not kinds of drinks to do the experiment. Because it is hard to judge pH level with one colour measurement.
+I made 3 solutions with different proportions of red cabbage, distilled water and expresso coffee.
+. 5ml red cabbage solution + 1ml distilled water + 1ml coffee
+. 5ml red cabbage solution + 0.5ml distilled water + 1.5ml coffee
+. 5ml red cabbage solution + 1.5ml distilled water + 0.5ml coffee
+As you can see on follow picture, the coulour results are not obvious. The
+[[File:4591516359873_.pic_hd.jpg|400px]]
+.1.2018
+I did the experiment of reversibility of colour change.
+ml pH=2 + 2ml pH=9
+[[File:4601516362910_.pic_hd.jpg|400px]]
+ml pH=2 + 2ml pH=11
+[[File:4631516362932_.pic_hd.jpg|400px]]
+ml pH=2 + 2ml pH=13
+[[File:4621516362920_.pic_hd.jpg|400px]]
+ml pH=4 + 2ml pH=9
+[[File:4641516362943_.pic_hd.jpg|400px]]
+pH of expresso coffee is around 6, I add solution (pH=9) into solution 1/2/3, and obtain obviously colour changing.
+ [[File:4581516359845_.pic_hd.jpg|400px]]
 ==References==