Why is phenophtalein can be used as invisibleink?
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Answer:
Other sympathetic inks work because of acid-base reactions. Use phenolphthalein solution to write a message on a piece of paper and let it dry. ...
Explanation:
Phenolphthalein is a pH indicator that is pink in the presence of bases. Since Windex is a base, it causes your phenolphthalein writing to appear.
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