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==References== | ==References== | ||
* https://ellieirons.com/projects/two-meadows/ | * https://ellieirons.com/projects/two-meadows/ | ||
I use red cabbage to make pH indicator. The pH solution from 2 to 13. | |||
1. pH=2 100ml distilled water + 1ml HCL | |||
2. pH=4 100ml distilled water + 0.1g apple acid | |||
3. pH=5.5 100ml distilled water + 2g H3BO3(Boric acid) | |||
4. pH=7 100ml distilled water | |||
5. pH=8 100ml distilled water + 0.5g NaHCO3 | |||
6. pH=11 700ml distilled water + 1ml NaOH | |||
7. pH=12 250ml distilled water + 1ml NaOH | |||
8. pH=13 100ml distilled water + 1ml NaOH | |||
Next step: | |||
1. Rate of colour change | |||
2. Reversibility of colour change | |||