Ionic solid \( \mathrm{Na}^{+} \mathrm{A}^{-} \)crystallise in rock salt type structure. \( 2.59...

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Ionic solid \( \mathrm{Na}^{+} \mathrm{A}^{-} \)crystallise in rock salt type structure. \( 2.592 \mathrm{gm} \) of ionic solid salt, \( \mathrm{NaA} \) dissolved in water to make 2 litre solution. The \( \mathrm{pH} \) of this solution is 8 . If distance between cation and anion is \( 300 \mathrm{pm} \), calculate desnsity of ionic solid (in \( \mathrm{gm} / \mathrm{cm}^{3} \) ).
\( \left(\right. \) Given: \( \left.\mathrm{pK}_{\mathrm{w}}=13, \mathrm{pK}_{\mathrm{a}}(\mathrm{HA})=5, \mathrm{~N}_{\mathrm{A}}=6 \times 10^{23}\right) \)
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