A lime-soda softening plant treats a flow of 100 MGD, and the water has a hardness of 230 mg/L as CaCO3 and alkalinity of 185 mg/L as CaCO3, a Mg2 ion content of 42 mg/L, and 4 mg/L of CO2. Assume the system requires the addition of 1.25 meq/L of quicklime to raise the pH to a sufficient level that any precipitation will take place; this quicklime is in addition to any other quicklime needed. The commercial grade of quicklime has a purity of 88%, and the soda ash has a purity of 93%. Determine: The pounds of quicklime and soda ash required per million gallons. The tons of quicklime and soda ash required per month if a month is considered to be 30 days.

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.

the pseudoscience are like beliefs, theories, or like practices that are considered scientific