86.2k views
1 vote
Rank the following silver compounds from most soluble to least soluble. AgCl, AgBr, AgI, AgNO2, AgSCN, Ag2O.

User Jml
by
7.7k points

1 Answer

3 votes

The order of solubilities is AgNO₂ > AgCl > Ag₂O > AgSCN > AgBr > AgI

Unless you look up the solubilities, I think you must use the Kₛₚ values to calculate solubilities.

For the AgX compounds

AgX ⇌ Ag⁺ +X⁻

Kₛₚ = s × s =s²

s = √Kₛₚ

For Ag₂O, the equation is

Ag₂O + H₂O ⇌ 2Ag⁺ + 2OH⁻

Kₛₚ = 2s × 2s = 4s²

s = ½√Kₛₚ

I found the following values and calculated the solubilities.

Compound Kₛₚ s(mol·L⁻¹)

AgCl 1.77×10⁻¹⁰ 1.33×10⁻⁵

AgBr 5.35×10⁻¹³ 7.31×10⁻⁷

AgI 8.52×10⁻¹⁷ 9.23×10⁻⁹

AgNO₂ 6.0×10⁻⁴ 2.5×10⁻²

AgSCN 1.03×10⁻¹² 1.01×10⁻⁶

Ag₂O 1.52×10⁻⁸ 6.16×10⁻⁵

AgNO₂ > AgCl > Ag₂O > AgSCN > AgBr > AgI

User Shantie
by
8.1k points