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GMU:DIY Biolab “Driver’s License”/Yang Li (view source)
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== Using red cabbage solution as an indicator to check coffee pH level == | == Using red cabbage solution as an indicator to check coffee pH level == | ||
===1. Introduction=== | |||
1.1 anthocyanin | 1.1 anthocyanin | ||
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"Red cabbage is rich in a number of bioactive substances, including anthocyanins"[Wiczkowski, 2012]. The method of extracting anthocyanin from red cabbage is easy and convenient. | "Red cabbage is rich in a number of bioactive substances, including anthocyanins"[Wiczkowski, 2012]. The method of extracting anthocyanin from red cabbage is easy and convenient. | ||
===2. Idea=== | |||
Coffee always mixed with milk and sugar. We know coffee is a kind of acid drink. When it mixed with water the pH level will change. I want make its pH readable through my experiment. | Coffee always mixed with milk and sugar. We know coffee is a kind of acid drink. When it mixed with water the pH level will change. I want make its pH readable through my experiment. | ||
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===3. Methodology=== | |||
3.1. Making red cabbage indicator | 3.1. Making red cabbage indicator | ||
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[[File:result.jpg|400px]] | [[File:result.jpg|400px]] | ||
===4. Discussion=== | |||
The colour changing is very obviously when drop red cabbage solution into different pH solutions which are coloured transparent. However, coffee is dark, when drop red cabbage solution directly, it is hard to see the colour difference. I use the result of reversibility of colour change, add pH=8 solution into the original coffee and obtain the obviously changing. | The colour changing is very obviously when drop red cabbage solution into different pH solutions which are coloured transparent. However, coffee is dark, when drop red cabbage solution directly, it is hard to see the colour difference. I use the result of reversibility of colour change, add pH=8 solution into the original coffee and obtain the obviously changing. | ||
===5. References=== | |||
[1] Robert Boyle. 1664. Experiments and Considerations Touching Colours. Project Gutenberg. 1–157 pages. | [1] Robert Boyle. 1664. Experiments and Considerations Touching Colours. Project Gutenberg. 1–157 pages. | ||