What mass of \( \mathrm{NaOH} \) should be dissolved in P sufficien...

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What mass of \( \mathrm{NaOH} \) should be dissolved in
P sufficient water to get \( 20 \mathrm{~m}^{3} \) of an aqueous solution

W of \( \mathrm{pH} 7.3 \) at \( 25^{\circ} \mathrm{C} \) ?
(1) \( 0.16 \mathrm{~g} \)
(2) \( 1.6 \times 10^{-4} \mathrm{~g} \)
(3) \( 0.04 \mathrm{~g} \)
(4) \( 0.12 \mathrm{~g} \)
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