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1. When HOCl (Cl2) is added to water, it will react with ammonia to form chloramine:
NH3 + HOCl → NH2Cl + H2O
A solution containing 0.5 mg/L of ammonia is dosed with 4.0 mg/L of Cl2 in a batch contact vessel. If the rate constant for the reaction is k = 5 x 106 L/mol-s, estimate the time required to reduce the ammonia concentration by 50%.
2. When ultraviolet light is used for disinfection, the rate of die-off of bacteria may be expressed as rN = - k' I N, where I is the light intensity. Unfortunately, intensity decreases exponentially with penetration depth, i.e., I = I0e?ax. The average intensity over a depth, x, may be expressed as I = (I0/ax) [1 - e?ax]. A disinfection system is designed for a 99.9% kill rate when the water depth is 2 inches. During operation, however, the water depth is 2.5 inches. What is the resulting percent kill? The absorption (extinction) coefficient ("a") has been measured as 0.05 cm?1.
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The assignment consisted of 2 numericals. I have solved them in the same word file. The solution has been highlighted by yellow colour.
Show all the steps in the mechanism for the following reaction, When benzene is mixed with deuterated sulfuric acid, deuterium is slowly incorporated onto the ring. Show the mechanism for this reaction and explain how this relates the sulfonation of ..
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