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Which of the following expressions is/ar...

Which of the following expressions is/are true?
`[H^(+)]=[OH^(-)]=sqrt(K_(w))` for a neutral solution
`[OH^(-)]` < `sqrt(K_(w))` for an acidic solution
`pH+pOH=14` at all temperatures
`[OH^(-)]=10^(-7) M` for a neutral solution at `25^(o)C`

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