Solubility product (Salze-70) The following salts are given. Formulate the solubility product. Fresh or chilled Calcium CaF2 NH4Cl AlBr3 Iron (III) oxide Calcium sulphate

  Exercise: Salze-70    

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The following salts are given. Formulate the solubility product.

1. Fresh or chilled
2. Calcium
3. CaF₂
4. NH₄Cl
5. AlBr₃
6. Iron (III) oxide
7. Calcium sulphate

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Solution:

Notes:
— A first step is to consider which ions the salt 'melt' into, balance it, and then define the solubility product.
— The polyatomic anions – cations recognition. 'disintegration' not continued.
— The balanced reaction for an (!) educated part formulation!

1. NaCl ⇄ Na⁺ + Cl^–      L_p(NaCl) = c(Na⁺)·c(Cl^–)
2. CaCO₃ ⇄ Ca²⁺ + CO2-3      L_p(CaCO₃) = c(Ca²⁺)·c(CO2-3)
3. CaF₂ ⇄ Ca²⁺ + 2F^–      L_p(CaF₂) = c(Ca²⁺)·c²(F^–)
4. NH₄Cl ⇄ NH+4 + Cl^–      L_p(NH₄Cl) = c(NH+4)·c(Cl^–)
5. AlBr₃ ⇄ Al³⁺ + 3 Br^–      L_p(AlBr₃) = c(Al³⁺)·c³(Br^–)
6. Fe₂O₃ ⇄ 2Fe³⁺ + 3O^2-      L_p(Fe₂O₃) = c²(Fe³⁺)·c³(O^2-)
7. CaSO₄ ⇄ Ca²⁺ + SO2-4      L_p(CaSO₄) = c(Ca²⁺)·c(SO2-4)

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