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# How much soda ash (Na2CO3) in kg/day do you need to add to remove calcium hardness...

How much soda ash (Na2CO3) in kg/day do you need to add to remove calcium hardness from 200 mg/L CaCO3 to 50 mg/L CaCO3 if you have a water source with flowrate of 1000 m3/day. Consider the following unbalanced reaction that describes the process of Ca2+ removal. Ca2+ + Na2CO3 ↔ CaCO3↓ + Na+ Considering the soda ash has 96% purity and it costs \$0.5/kg, how much would it cost the water treatment plant per year (365 days)?

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