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The function of $\mathrm{Fe}(\mathrm{OH})_{3}$ in the contact process is
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to remove arsenic impurity
The function of $\mathrm{Fe}(\mathrm{OH})_{3}$ in the contact process is to remove arsenic impurity. $\mathrm{Fe}(\mathrm{OH})_{3}$ is a positive sol, hence it removes arsenic impurity which is a negative sol.
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