1. Water is frequently disinfected with chlorine gas, forming hypochlorous acid (HOCI), which partially ionizes to hypochlorite (OCI) and hydrogen ions as follows: HOCI H+ + OCI- The concentration of HOCI, which is the desired disinfectant, depends on the water pH. a) Write the equations to express the two ionization fractions for HOCI, that is, ao and ai.

Solid Waste Engineering
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ISBN:9781305635203
Author:Worrell, William A.
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Chapter7: Thermal Processes
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1. Water is frequently disinfected with chlorine gas, forming hypochlorous acid (HOCI), which partially
ionizes to hypochlorite (OCI) and hydrogen ions as follows:
HOCI H+ + OCI-
The concentration of HOCI, which is the desired disinfectant, depends on the water pH.
a) Write the equations to express the two ionization fractions for HOCI, that is, ao and ai.
b) Plot ionization fractions vs pH, clearly identifying a regions and pKa, at 25 °C.
c) Plot speciation of HOCI vs pH (log[OCI] vs pH) for a Croci-= 0.05, clearly identifying regions and
pKa, at 25 °C.
Transcribed Image Text:1. Water is frequently disinfected with chlorine gas, forming hypochlorous acid (HOCI), which partially ionizes to hypochlorite (OCI) and hydrogen ions as follows: HOCI H+ + OCI- The concentration of HOCI, which is the desired disinfectant, depends on the water pH. a) Write the equations to express the two ionization fractions for HOCI, that is, ao and ai. b) Plot ionization fractions vs pH, clearly identifying a regions and pKa, at 25 °C. c) Plot speciation of HOCI vs pH (log[OCI] vs pH) for a Croci-= 0.05, clearly identifying regions and pKa, at 25 °C.
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