H2S from cigarette smoke was collected by bubbling smoke through aqueous NaOH and measured with a sulfide ion-selective electrode. Standard additions of volume VS containing Na2S at concentration +cS = 1.78 mM were then made to V0 = 25.0 mL of unknown and the electrode response, E, was measured.
From a separate calibration curve, it was found that β = 0.985 in Equation 14-14. Using T =298.15 K and n = -2 (the charge of S2-), prepare a standard addition graph with Equation 14-15 and find the concentration of sulfide in the unknown.
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