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Tube-well water, if left for sometime, a...

Tube-well water, if left for sometime, assumes a brownish turbidity-explain.

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Tube-well water sometimes contains soluble ferrous bicarbonate [Fe(HC`O_(3))_(2)` ] . This compound, on aerial oxidation is converted into brown ferric hydroxide, Fe`(OH)_(3)`, which remains in water as colloidal suspension and because of this, water assumes a brownish turbidity.
4Fe`(HCO_(3))_(2) + 2H_(2)O + O_(2) rarr underset((brown))(4Fe(OH)_(3)) + 8CO_(3)`
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