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washing soda, Na2CO3-10H2O, is often used to soften hard water; to remove the hardening ions. assuming hardness is due to Ca^2+, the CO3^2- ion precipitates the Ca^2+.

How many grams and pounds of washing soda are needed to remove the hardness from 500 gallons of water that has a hardness of 150 ppm CaCO3?

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