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How iscopperextractedfromalow gradeoreof it? |
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Answer» Solution : Copperisextractedbyhydrometallurgy. The lowgradeoresareleachedwith an acid (i.e., DIL.`H _2 SO _4 `)whenmetal goes intosolutionas` Cu ^(2 + ) `ions. ` "" ` Lowgradecopperore`overset ( H^(+)) toCu^(2 + ) (aq)` Coppermetal isthenobtainedbytreatingthe` Cu ^( 2+ ) `ionssolutionswith eitherscrap iron or`H_2`gas. Since` E ^(@) `of` Fe^( 2+)//Fe ` ( - 0`*`44V) or thatof`H ^(+)//H_2`(0`*`0 V) redox coupleis LOWER than thatof` Cu^( 2 +)//Cu ( +0 *34 V ) `,THEREFORE,` Fe orH_ 2`can displaceCu from` Cu^( 2+) `ions ` "" Cu^( 2+ ) (aq) + Fe (s) toCu (s) +Fe ^( 2 + ) (aq) ,` ` Cu^( 2+ )(aq) +H_2(g) toCu(s)+2H^( + ) (aq) ` |
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