12. Iron hydroxide sol was obtained by adding 15 ml of a 2% solution of iron(III) chloride to 85 ml of boiling distilled water. Write the formula for the micelles of Fe(OH)3 sol, taking into account that the following ions are present in the solution during the formation of iron(III) hydroxide particles: Fe+3, FeOH+, Cl-. Determine the charge of the colloidal particle.

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