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\( 100 \mathrm{ml} \). of a buffer solution contains \( 0.1 \mathrm{M} \) each of
P weak acid \( \mathrm{HA} \) and salt \( \mathrm{NaA} \). How many gram of

W \( \mathrm{NaOH} \) should be added to the buffer so that its \( \mathrm{pH} \) will be \( 6 ?\left(\mathrm{~K}_{\mathrm{a}}\right. \) of \( \left.\mathrm{HA}=10^{-5}\right) \).
(1) 0.328
(2) 0458
(3) 4.19
(4) None
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