Answer:
The first silver salt in precipitate is Ag₃AsO₄, then AgI and, in the last, Ag₂CO₃
Explanation:
The Ksp equilibrium for Ag₃AsO₄ is:
Ag₃AsO₄ ⇄ 3 Ag⁺ + AsO₄³⁻
ksp = 1,0 x 10⁻²² = [Ag⁺]³ [AsO₄³⁻]
For AgI is:
AgI ⇄ Ag⁺ + I⁻
ksp = 8,3 x 10⁻¹⁷ = [Ag⁺] [I⁻]
And for Ag₂CO₃ is:
Ag₂CO₃ ⇄ 2 Ag⁺ + CO₃²⁻
ksp = 8,1 x 10⁻¹² = [Ag⁺]² [CO₃²⁻]
A low ksp value means that ions concentration is low doing salt concentration high. In other words, the lower ksp value, the first in precipitate.
Thus, <em>the first silver salt in precipitate is Ag₃AsO₄, then AgI and, in the last, Ag₂CO₃</em>
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I hope it helps!