A 50.00 mL aliquot of liquid from a sewage holding tank was brought to pH 13 with sodium hydroxide and diluted to 100.0 mL. The voltage across a sulfide ion and calomel electrode immersed in the solution was 0.337 V. After addition of 10.00 mL of 2.50Ã10^-3 M Na2S, the voltage across the electrodes was 0.324 V. Calculate the concentration of sulfide in the water as ppm S2-.

Question

A 50.00 mL aliquot of liquid from a sewage holding tank was brought to pH 13 with sodium hydroxide and diluted to 100.0 mL. The voltage across a sulfide ion and calomel electrode immersed in the solution was 0.337 V. After addition of 10.00 mL of 2.50Ã10^-3 M Na2S, the voltage across the electrodes was 0.324 V. Calculate the concentration of sulfide in the water as ppm S2-.

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