A&B Test Questions - Florida Rural Water Association

21: In spilt treatment, a portion of the water, about ____ is treatedwith an excess amount of lime to remove the ____ pH of over ____.A: 20%; calcium; 7B: 90%; calcium; 8.3C: 20%; magnesium; 7D: 90%; magnesium; 11.122: The determination of total hydroxide alkalinity is an important control test used in the limesoftening process. What is the correct method of determining this number?A: T.H.-T. Alk.B: 2T - PC: 2 P - T.H.D: 2 P – T23. Soda ash is commonly used in water treatment to:A: remove temporary hardnessB: remove all hardnessC: remove permanent hardnessD: lower the pH24: Calculate the dosage in mg/l hydrated lime Ca(OH)2 required tosoften the water with the characteristics given. /ParameterCO2 12 mg/ l 0 mg/lTotal Alkalinity 202 mg/l 30 mg/lTotal Hardness 230 mg/l 50 mg/lMg 10 mg/l 2 mg/lPH 7.2 9.0Lime Purity 90%A: 188 mg/LB: 256 mg/LC: 287 mg/LD: 174 mg/LMATH APPLICATIONSection16