Ionic solid B^+A^(-) crystallizes in rock salt type of structure.1.296 gm ionic solid salt B^+A^(-) is dissolved in water to make one litre solution.The pH of the solution is measured to be 6.0.if the value of face diagonal in the unit cell of B^+A^(-) be 600sqrt2 pm.Calculate the density of ionic solid in gm/cc.(T=298 K, K_b "for" BOH "is" 10^(-6),(Avogadro Number =6.0xx10^(23)))

Ionic solid B^+A^(-) crystallizes in rock salt type of structure.1.296

1.	Ionic solid B^+A^(-) crystallizes in rock salt type of structure.1.296 gm ionic solid salt B^+A^(-) is dissolved in water to make one litre solution.The pH of the solution is measured to be 6.0.if the value of face diagonal in the unit cell of B^+A^(-) be 600sqrt2 pm.Calculate the density of ionic solid in gm/cc.(T=298 K, K_b "for" BOH "is" 10^(-6),(Avogadro Number =6.0xx10^(23)))
Answer» Solution :`pH=1/2{pK_w -pK_b- log C} IMPLIES square6=7.0-5/2-1/2"log C" " " implies " " C=0.01 M` `:. C=1.296/("MOLAR MASS")=1/100 " " implies ` molar mass of salt =129.6 For rock salt, `600sqrt2=sqrt2a` a=600 pm=`600xx10^(-10) cm` effective number of formula units z=4 Now density `=Z/N_A (M/a^3)=4/(6.0xx10^23)[129.6/((600)^3xx10^(-30))]=4` gm/cc.