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Q.

Ionic solid Na+ A- crystallise in rock salt type structure. 2.592 gm of ionic solid salt NaA dissolved in water to make 2 litre solution. The pH of this solution is 8. If distance between cation and anion is 300 pm, calculate density of ionic solid (in gm/cm3) . (Given : pKw=13,pKa(HA)=5,NA=6×1023 )

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Detailed Solution

NaA is salt of SB and WApH=pKw2+12pKa+log⁡c8=6.5×12(5+log⁡c)1.5×2=5+log⁡clog⁡c=−2c=0.01=2.592M×2M=2.5922×0.01=129.6D=ZMNAa3 Z=4=4g/cm3 a=2×300=600pm

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