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0.324 g of copper was dissolved in nitri...

0.324 g of copper was dissolved in nitric acid and the copper nitrate so produced was burnt till all copper nitrate converted to `0.406` g of copper oxide. Calculate the equivalent weight of copper.

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`underset(0.324 "g")(Cu+ HNO_3) to "copper nitrate" tounderset(0.406 "g") "copper oxide"`
Suppose the equivalent weight of copper `(Cu)` is `E_(Cu)`.
Equivalent of Cu `=` equivalent of copper oxide
`(0.324)/(E_(Cu) )= (0.406)/("eq. wt. of copper oxide")`
`(0.324)/( E_(Cu) ) = ( 0.406)/("eq. wt. of Cu + eq. wt. of O")= ( 0.406)/( E_(Cu ) +8)`
Hence the equivalent weight of Cu is `31.60`.
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