The reaction between magnesium ions (Mg²⁺) and sodium stearate (NaC₁₇H₃₅COO) results in the formation of magnesium stearate (Mg(C₁₇H₃₅COO)₂) and sodium ions (Na⁺). This is a double displacement reaction.

Here's the balanced chemical equation:

Mg²⁺(aq) + 2 NaC₁₇H₃₅COO(aq) → Mg(C₁₇H₃₅COO)₂(s) + 2 Na⁺(aq)

Explanation:

* Magnesium ions (Mg²⁺) react with two molecules of sodium stearate (NaC₁₇H₃₅COO).

* The stearate anions (C₁₇H₃₅COO⁻) displace the sodium ions (Na⁺) from the stearate molecules.

* Magnesium stearate (Mg(C₁₇H₃₅COO)₂) is formed as a solid precipitate, while sodium ions (Na⁺) remain in the solution.

Note: Magnesium stearate is a common ingredient in cosmetics, pharmaceuticals, and other products as a lubricant, thickener, and stabilizer.