A&B Test Questions - Florida Rural Water Association

22: Scaling is a problem in hot water systems because _____ is lesssoluble in hot water than In cold water.A: IronB: dissolved oxygenC: chlorineD: calcium carbonate23: Test results indicate a pHs value of 8.7 and a pH value of 8.8 for treated water. What doesthis mean?A: the water is corrosiveB: the Langleir index is between -0.2 and .0.2C: the pH should be increased to 9.5D: the water is undersaturated with calcium24: In selecting corrosion control chemicals, If the product from multiplying the calciumhardness by the alkalinity is 80, this indicates that:A: either lime or soda ash would be satisfactoryB: both lime and carbon dioxide may be requiredC: soda ash will be ruled out because of expenseD: the water is stable and requires no calcium25. gram of calcium carbonate is added to a filtered water sample giving the following results;determine the calcium carbonate precipitation potential.Initial pH = 8.7Final pH = 9.1Initial Hardness = 34 mg/lFinal Hardness = 38 mg/lInitial Alkalinity = 24 mg/lFinal Alkalinity = 27 mg/l.a. 0.4b. –3c. –4d. 3e. 429