Test substances, called acid-base indicator
1. Glass 1 (liquid bleaching white) will turn yellow, then white liquid bleaching as bass
2.Glass 2 (bicarbonate of soda / baking soda) to blue shift shows that bleach is the base. But don't concentrate as liquid bleaching white
3. Glass 3 (Lemonade) will turn red, then น้ำมะนาวเป็น acid
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