Ferric chloride is used as a coagulant for drinking water treatment. It reacts with bicarbonate to...

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Ferric chloride is used as a coagulant for drinking watertreatment. It reacts with bicarbonate to form iron hydroxideprecipitate as follows: FeCl3â€¢7H2O + HCO3- â†” Fe(OH)3(s) + CO2 + Cl-+ H2O
(a) Balance the above reaction. Rewrite the complete balancedreaction.
(b) If 20 mg/L of ferric chloride are added to treat streamwater, calculate the amount (mg/L) of ferric hydroxide sludge thatwill be formed.

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3.6 Ratings (545 Votes)

(a)

balanced reaction :

FeCl3â€¢7H2O + 3 HCO3-Â Â Â Â Â Â --------------------------> Fe(OH)3(s) + CO2 + 3 Cl- + 7H2O

288.3 gÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 106.87 g

20 x 10^-3 gÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ?

Fe(OH)3 mass = 20 x 10^-3 x 106.87 / 288.3

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 7.41 x 10^-3 g

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 7.41 mg /L

ferric hydorxide = 7.41 mg /L

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