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$$ $$)

Question

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$$ $$)

Infinity Learn · Accepted Answer

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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