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  • Give an example to show the effect of concentration of nitric acid on the formation of oxidation product.

Give an example to show the effect of concentration of nitric acid on the formation of oxidation product.

 

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We get different oxidation products on reaction of dilute and concentrated nitric acid with copper metals.  For example, zinc with very dilute HNO_{3}\left ( 6 \; ^{o}/_{o} \right ) forms NH_{4}NO_{3}, with dilute HNO_{3}\left ( 20 \; ^{o}/_{o} \right ) forms N_{2}O and with cone. HNO_{3}\left ( 70 \; ^{o}/_{o} \right ) forms NO_{2}.

(Very dilute) HNO_{3}:4Zn+10HNO_{3}\rightarrow 4Zn(NO_{3})_{2}+NH_{4}NO_{3}+3H_{2}O

(Dilute) HNO_{3}:4Zn+10HNO_{3}\rightarrow 4Zn(NO_{3})_{2}+N_{2}O+5H_{2}O

(Concentrated) HNO_{3}:Zn+HNO_{3}\rightarrow Zn(NO_{3})_{2}+2NO_{2}+2H_{2}O

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