I HAVE THE GIVEN ANSWER TO THIS PROBLEM ,, I NEED TO KNOW HOWTO WORK IT, THANKS

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I HAVE THE GIVEN ANSWER TO THIS PROBLEM ,, I NEED TO KNOW HOWTO WORK IT, THANKS Determine the lime and soda ash dose, in mg/L as CaCO3, to soften the following water to a final hardness of 80.0 mg/L as CaCO3. If the price of lime, purchased as CaO, is $100.00 per megegram (Mg), and the price of soda ash, purchased as Na2CO3 is $200.00 per Mg, what is the annual chemical cost of treating 0.500 m3/s of this water? Assume the lime and soda ash are 100 percent pure. The ion concentrations reported below are all mg/L as CaCO3. Ca2 + = 200.0 Mg2+ = 100.0 HCO3- = 150.0 CO2 = 22.0 Answers: Lime = 272.0 mg/L as CaCO3 Soda = 110. Mg/L as CaCO3 Total annual cost = $607, 703.25, or $608,000

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