buffer )Find a buffer to maintain a laboratory system for coagulation at a pH of 5.5.  The system uses a ferric chloride coagulant and generates acidity as defined by the reaction in equation (1).  If the coagulant dose is 10 mg/L Fe+3 calculate the concentration of the buffer to maintain the pH at a level within 0.2 pH units. FeCl3 + 3 H2O ↔ Fe(OH)3 (s) + 3H+ + 3Cl-

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