distinguish of NaCI and vinegar
回答 (1)
2007-01-12 4:11 am
✔ 最佳答案
phenolphthalein is pink when pH>8, since NaCl is neutral, pH=7, vinegar is acidic, pH<7, phenolphthalein is colourless at thses pH range.用pH paper 就可以了
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