Calculate \( \left[\mathrm{H}^{+}\right] \)at equivalent point between titration of \( 0.1 \math...

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Calculate \( \left[\mathrm{H}^{+}\right] \)at equivalent point between titration of \( 0.1 \mathrm{M}, 25 \mathrm{~mL} \) of weak acid \( \mathrm{HA} \) \( \left(K_{a(\mathrm{HA})}=10^{-5}\right) \) with \( 0.05 \mathrm{M} \mathrm{NaOH} \) solution :
(a) \( 3 \times 10^{-9} \)
(b) \( 1.732 \times 10^{-9} \)
(c) 8
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