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`1.12 g` impure sample of calcium oxide was dissolved in water and the solution was completely neutralised by `21 mL of 0.8N` acid. What is purity of

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`1.12 g` impure sample of calcium oxide was dissolved in water and the solution was completely neutralised by `21 mL of 0.8N` acid. What is purity of `CaO`?
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Meq. Of `CaO=`Meq. of acid used
`(w)/(56//2)xx1000= 21xx0.8`
`:. w=(21xx0.8xx56)/(2000)=0.47 g`
`:. % "purity"=(0.47)/(1.12)xx100= 42% CaO`
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