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MgCl₂ ₊ Na₂CO₃ ⇒ MgCO₃ ₊ 2 NaCl
4.10⁻² 4.10⁻² 4.10⁻²
massa MgCO₃ = mol x Mr
= 4.10⁻² x (24 + 12 + 48)
= 4.10⁻² x 84
= 336.10⁻² = 3,36 gr
* Ksp hanya membuktikan apakah larutan mengendap atau tidak, karena Q MgCO₃ (4.10⁻²) > Ksp MgCO₃(3.10⁻⁸) maka menghasilkan endapan.