Which metal will spontaneously react with Zn²⁺(aq), but will not
spontaneously react with Mg²⁺ (aq)?

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Petergoodwill1977idn Petergoodwill1977idn

02-08-2022
Chemistry

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Which metal will spontaneously react with Zn²⁺(aq), but will not
spontaneously react with Mg²⁺ (aq)?

Sagot :

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Vipinkumar69547idn Vipinkumar69547idn · Answer 1 · 2022-08-05T02:33:46-04:00

Mn(s) metal will spontaneously react with Zn²⁺(aq), but will not

spontaneously react with Mg²⁺ (aq)

The Eo value of an electrochemical cell determines its spontaneity. Positive Eo electrochemical cells are spontaneous, and vice versa.

The relevant Eo of the half-cell in this instance are as follows for Mn(s) metal

Zn2+/Zn = -0.763v for Eo

2.37v for Eo Mg2+/Mg.

Mn2+/Mn = -1.18v for Eo.

Consequently, the equation for an Eo cell (with Zn as one of the half-cells) is: Eo Zn2+/Zn - Eo Mn2+/Mn = -0.763 - (-1.18) = 0.417v.

On the other hand, the equation for an Eo cell (with Mg as one of the half-cells) is: Eo Mg2+/Zn - Eo Mn2+/Mn = -2.37 - (-1.18) = -1.19v.

As a result, Mn(s) metal will spontaneously react with Zn2+(aq), but not with Mg2+ (aq)

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