Multiple choice

Chlorine gas (8 mg/L as Cl2) was added to a drinking water sample. If the free chlorine residual and pH was measured to be 2 mg/L (as Cl2) and 7.5 respectively, what is the concentration of residual OCF ions in the water? Assume that the chlorine gas added to the water is completely converted to HOCI and OCI–. Atomic Weight of Cl is 35.5. Given: OCl– + H+$\underline{\underrightarrow{K}}$HOCl, K = 107.5

  1. 1.408x10–5 moles/L

  2. 2.817x10–5 moles/L

  3. 5.634x10–5 moles/L

  4. 1.127x10–4 moles/L
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B Correct answer
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