People often encounter some stannous fluoride (SnF2) when brushing their teeth.

Question

People often encounter some stannous fluoride (SnF2) when brushing their teeth. Tin ions and

fluoride are known to react in the following three steps: (all Kf values are approximates)

Sn2+(aq) + F-(aq) %u2190%u2192 SnF+(aq) Kf1 = 4.0 x 10^3

SnF+(aq) + F-(aq) %u2190%u2192 SnF2 (aq) Kf2 = 2.7 x 10^3

SnF2 (aq) + F-(aq) %u2190%u2192 SnF3-(aq Kf3 = 9.1 x 10^1

(A) In the first reaction which species is acting as a Lewis Acid? Lewis acid =____________

(B) Complete this expression for the analytical concentration of Sn2+:CSn2+ = [Sn2+] + _________________________

Explanation / Answer

A) Lewis acid = Sn2+ ( because it accepts a lone pair of electrons)

B) Sn2+:CSn2+ = [Sn2+] + [SnC]

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