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1. BASE Problem Calculate the pH of a 10-3 M solution of Na2s. pKa values are in the textbook. 2. ACID Problem Calculate the pH of a solution of 10-3 chromic acid (H2cro4); pKa1 0.74; pKa2 6.49 both at 25 c 3. Buffer 1 calculate the pH of a buffer solution prepared by mixing 10 g KH2PO4 with 50 g K2HPO4 in 1 liter of water. 4. Buffer 2 Find a buffer to maintain a laboratory system for coagulation at a pH of 5.5. The system uses a ferric chlorid 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 H20 Fe(OH) 3 (s) 3H+ 3Cl (1) 5. ALKALINITY A city water sample has 20 mg/L Hco3 and 40 mg/L Co32 What is the alkalinity of this water?

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