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

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References


I use red cabbage to make pH indicator. The pH solution from 2 to 13.

The red cabbage solution

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1. pH=2 100ml distilled water + 1ml HCL

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2. pH=4 100ml distilled water + 0.1g apple acid

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3. pH=5.5 100ml distilled water + 2g H3BO3(Boric acid)

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4. pH=7 100ml distilled water

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5. pH=8 100ml distilled water + 0.5g NaHCO3

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6. pH=11 700ml distilled water + 1ml NaOH

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7. pH=12 250ml distilled water + 1ml NaOH

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8. pH=13 100ml distilled water + 1ml NaOH

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after 5 minutes change to yellow

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Next step:

1. Rate of colour change

2. Reversibility of colour change