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In a solution \( 0.04 \mathrm{M} \mathrm{FeCl}_{2}, 0.02 \mathrm{MFeCl}_{3} \) and \( 0.01 \mathrm{MHCl} \), how large may be its \( \mathrm{pH} \) without there being precipitation of either \( \mathrm{Fe}(\mathrm{OH})_{2} \) or \( \mathrm{Fe}(\mathrm{OH})_{3} \) ? \( K_{s p} \) of \( \mathrm{Fe}(\mathrm{OH})_{2} \) and \( \mathrm{Fe}(\mathrm{OH})_{3} \) are \( 8 \times 10^{-16} \) and \( 4 \times 10^{-38} \) respectively.
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