What would be the pH if 10-2 moles of hydrofluoric acid (HF) were added to 1 L pure water? The pKa of HF is 3.2
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What would be the pH if 10-2 moles of hydrofluoric acid (HF) were added to 1 L pure water? The pKa of HF is 3.2.
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- Calculate the exact alkalinity (in mg/L as CaCO3) of a water containing 120.0 mg/L of bicarbonate ion and 15.00 mg/L of carbonate ion. The water has a pH of 9.4.Water is taken from a river to cool a power plant. The water accepts waste heat and is returned water back to the river. The return water has a flow rate of 200 gal/min, and the receiving river has a flow rate of 3,000 gal/min and a temperature of 18 degrees C in the summer at the point of mixing. If the maximum allowable temperature of the river after mixing is 22 degrees C before the fish die, what is the maximum allowable temperature of the return water?A bottle is filled with river water. The initial dissolved oxygen concentration is 10.2 mg/L. After 5 days the dissolved oxygen concentration is 3.0 mg/L. Calculate the BOD 5. in mg/l
- A water contains 100.0 mg/L CO2-3 and 75.0 mg/L HCO-3 at a pH of 10 (T =25C). Calculate the exact alkalinity. Approximate the alkalinity by ignoring the appropriate chemical species. Select one: a. 167 mg/L b. 233 mg/L c. 459 mg/L d. 385 mg/LCalculate the pH and alkalinity (in mol/L) of a water that contains 120.0 mg/L of bicarbonate ion and 15.00 mg/L of carbonate ion.Calculate "exact" alkalinity of the water containing 130 mg/L of bicarbonate ion, 25.00 mg/L of carbonate ion and the pH is 9.3
- You are treating 10 million gallons per day (MGD) of water with alum at a dosage of 50.0 mg/L. Alum is available as a hydrated salt Al2(SO4)3.16H2O. Determine:(a) The monthly alum dosage required in metric tons/month (1 metric ton = 1000 kg)(b) If you assume that each equivalent of alum added to the water consumes 1 equivalent of alkalinity, determine the alkalinity consumed by alum addition in milliequivalents/L (meq/L)(c) Given that the raw water contained 30 mg/L as CaCO3 of alkalinity, is the alkalinity sufficient? What would happen if the alkalinity is inadequate?For a solution with a pH equal to 9.5, express the concentrations of H+ and OH- in units of meq/L and mg/L as CaCO3.If the chlorine demand for a water is 3.0 mg/L, and the breakpoint is at 3.0 mg/L, what would the amount of chlorine that would need to be added in (in mg/L) if you desired to have a free chlorine residual of 2.0 mg/L in the water?
- A tank originally contains 380 liters of brineholding 450 g of dissolved salt. 8 liters/min ofbrine containing 3.75 g/L of salt enters the tankand the mixture assumed uniform leaves therate of 12 L/min. Determine the amount of saltafter 10 min.True or False The total water content of coal can be determined by multiplying it by the total hydrogen, as all hydrogen is derived from moisture and mixed water.A 0.15 L sample of water has an initial dissolved oxygen level of 8.35 mg/L. After five days in incubation in a 300 mL BOD bottle, the dissolved oxygen level has decreased to 4.09 mg/L. Calculate the BOD5.