AlluA

water treatment plant adds HOCl to its water as it leaves the water treatment plant. The HOCl concentration decreases as the water moves through the distribution system. If the flow rate from the water treatment plant is 2,000 m3 hr-1 and the distribution pipe is a cast iron pipe with a cross sectional area of 0.70 m2, what will be the approximate HOCl concentration at a home 20 km from the water treatment plant? The first order rate constant (k) for HOCl is 0.30 hr-1. Assume the initial HOCl concentration is equal to the concentration in part (a) at equilibrium (3 mg/L) and ignore impacts of changing pH. No corrosion inhibitor is added to the distribution system.

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