Question

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Problem 1 (25 pts) The influent water to a water treatment plant that treats 50x10° L/day has a pH of 7.5 and the following composition: eqmolW (g/mol) [1 | (me/L) | [1 (mg/L as CaCO) L) mg/L) | H2COs 100 2 62.0 3.2 161.3 Ca2 100 2 40.0 5.0 250.0 Mg2 40 2 24.4 3.3 163.9 Nat 43.5 20 0.9 23.0 300.0 300 100.0 6.0 ALK 114.6 2.3 96.0 110 SO1 a) Write the chemical reactions controlling the hardness removal in water. b) Calculate the total, the carbonate, and the non-carbonate hardness of the water. c) What is the dose of lime (purity 85%) and soda ash (purity 100%) that we need to add to soften the water?

Answer 1

Wan^ da on Ume t baladobd EDTA