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ostwald's theory of indicators

n.
1.(chemistry) the theory that all indicators are either weak acids or weak bases in which the color of the ionized form is different from the color before dissociation

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    Idiom of the Day

    play the fool
    to act like a fool, to act in a silly manner
    My friend made me play the fool when he left me waiting in the supermarket for two hours.



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    The man on the river bank, who is good at grammar, thinks the man really wants to drown, walks on and ________ .

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