E- for M2-aq - 2e- - M s where M - Ca- Sr or Ba is nearly constant-

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Introduction to Alkaline Earth Metals

E∘ for M2+a...

Question

$E^{\circ}$ for $M^{2 +} (a q) + 2 e^{-} \to M (s)$ (where M = Ca, Sr or Ba) is nearly constant.

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E^{o}

M^{2 +} + 2 e \to M (s)

=

E^{\circ}

M^{2 +} (a q) + 2 e^{-} \to M (s)

(M = C a, S r, B a) .

Comment on each of the following observations:

(a) The mobilities of the alkali metal ions in aqueous solution are Li⁺ < Na⁺ < K⁺< Rb⁺ < Cs⁺

(b) Lithium is the only alkali metal to form a nitride directly.

L i^{+} < N a^{+} < K^{+} < R b^{+} < C s^{+}

E^{⊖}

M^{2 +} (a q) + 2 e^{-} \to M (s)

M = C a, S r

B a

M (s) \to M (g) . . . . . (a)

M (s) \to M^{2 +} (g) + 2 e^{-} . . . . . (b)

M (g) \to M^{+} (g) + e^{-} . . . . . (c)

M^{+} (g) \to M^{2 +} (g) + e^{-} . . . . . (d)

M (g) \to M^{2 +} (g) + 2 e^{-} . . . . . (e)

M (s)

M^{+} (g)

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