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In the reaction given Mg(s)+NO(3)^(ɵ)+...

In the reaction given
`Mg(s)+NO_(3)^(ɵ)+H_(2)OtoMg(OH)_(2)(s)+overset(ɵ)(O)HO(aq.)+NH_(3)(g)` 20 " mL of " sample of `NO_(3)^(ɵ)` solution is treated with Mg. The `NH_(3)^(g)` was passed into 50 " mL of " 0.1 M HCl. The excess HCl requried 30 " mL of " 0.1 M KOH for its neutralisation calculate the molarity of `NO_(3)^(ɵ)` ions in the original sample?

Text Solution

Verified by Experts

Meq . of `NH_(3)` formed = Meq. of HCl used
`= 50 xx 0.15 - 32.10 xx 0.10`
` = 4.29`
Here, n-factor of `NH_(3)` is 1 (acid - base reaction)
For redox change,

(n- factor = 8)
` :. ` Meq. of `NH_(3)` for n- factor `8 = 8 xx 4.29`
` :. ` Normality of `NO_(3)^(-) = (34.32)/25 = 1.37`
Molarity of `NO_(3)^(-) = (1.37)/8 = 0.176`
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